pgsql: Replace useless uses of := by = in makefiles.

Log Message:
-----------
Replace useless uses of := by = in makefiles.

Modified Files:
--------------
    pgsql:
        GNUmakefile.in (r1.45 -> r1.46)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/GNUmakefile.in.diff?r1=1.45&r2=1.46)
    pgsql/contrib/tsearch2:
        Makefile (r1.17 -> r1.18)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/Makefile.diff?r1=1.17&r2=1.18)
    pgsql/doc:
        Makefile (r1.28 -> r1.29)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/Makefile.diff?r1=1.28&r2=1.29)
    pgsql/doc/src/sgml:
        Makefile (r1.94 -> r1.95)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/Makefile.diff?r1=1.94&r2=1.95)
    pgsql/src:
        Makefile.global.in (r1.232 -> r1.233)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.global.in.diff?r1=1.232&r2=1.233)
        Makefile.shlib (r1.106 -> r1.107)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.shlib.diff?r1=1.106&r2=1.107)
    pgsql/src/backend:
        Makefile (r1.121 -> r1.122)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/Makefile.diff?r1=1.121&r2=1.122)
    pgsql/src/backend/access:
        Makefile (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/Makefile.diff?r1=1.12&r2=1.13)
    pgsql/src/backend/catalog:
        Makefile (r1.62 -> r1.63)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/Makefile.diff?r1=1.62&r2=1.63)
    pgsql/src/backend/optimizer:
        Makefile (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/Makefile.diff?r1=1.12&r2=1.13)
    pgsql/src/backend/storage:
        Makefile (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/Makefile.diff?r1=1.12&r2=1.13)
    pgsql/src/backend/utils:
        Makefile (r1.24 -> r1.25)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/Makefile.diff?r1=1.24&r2=1.25)
    pgsql/src/backend/utils/mb/conversion_procs/ascii_and_mic:
        Makefile (r1.4 -> r1.5)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/ascii_and_mic/Makefile.diff?r1=1.4&r2=1.5)
    pgsql/src/backend/utils/mb/conversion_procs/cyrillic_and_mic:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/cyrillic_and_mic/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/euc_cn_and_mic:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/euc_cn_and_mic/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/euc_jp_and_sjis/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/euc_kr_and_mic:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/euc_kr_and_mic/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/euc_tw_and_big5:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/latin2_and_win1250:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/latin2_and_win1250/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/latin_and_mic:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/latin_and_mic/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_ascii:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_ascii/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_big5:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_big5/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_cyrillic:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_cyrillic/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_euc_cn:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_euc_cn/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_euc_jp:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_euc_jp/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_euc_kr:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_euc_kr/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_euc_tw:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_euc_tw/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_gb18030:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_gb18030/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_gbk:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_gbk/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_iso8859:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_iso8859/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_iso8859_1:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_iso8859_1/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_johab:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_johab/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_sjis:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_sjis/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_uhc:
        Makefile (r1.3 -> r1.4)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_uhc/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win:
        Makefile (r1.1 -> r1.2)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/conversion_procs/utf8_and_win/Makefile.diff?r1=1.1&r2=1.2)
    pgsql/src/bin:
        Makefile (r1.49 -> r1.50)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/Makefile.diff?r1=1.49&r2=1.50)
    pgsql/src/interfaces:
        Makefile (r1.54 -> r1.55)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/Makefile.diff?r1=1.54&r2=1.55)
    pgsql/src/interfaces/ecpg/test:
        Makefile (r1.65 -> r1.66)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/Makefile.diff?r1=1.65&r2=1.66)
    pgsql/src/pl:
        Makefile (r1.24 -> r1.25)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/Makefile.diff?r1=1.24&r2=1.25)
    pgsql/src/pl/plperl:
        GNUmakefile (r1.28 -> r1.29)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plperl/GNUmakefile.diff?r1=1.28&r2=1.29)
    pgsql/src/pl/plpgsql/src:
        Makefile (r1.29 -> r1.30)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/Makefile.diff?r1=1.29&r2=1.30)
    pgsql/src/pl/plpython:
        Makefile (r1.26 -> r1.27)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpython/Makefile.diff?r1=1.26&r2=1.27)
    pgsql/src/port:
        Makefile (r1.33 -> r1.34)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/Makefile.diff?r1=1.33&r2=1.34)
    pgsql/src/test/regress:
        GNUmakefile (r1.65 -> r1.66)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/GNUmakefile.diff?r1=1.65&r2=1.66)
    pgsql/src/timezone:
        Makefile (r1.24 -> r1.25)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/Makefile.diff?r1=1.24&r2=1.25)
    pgsql/src/timezone/tznames:
        Makefile (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/Makefile.diff?r1=1.1&r2=1.2)