pgsql: PGXS should be set with := not =, as specified in the

Log Message:
-----------
PGXS should be set with := not =, as specified in the documentation,
to avoid useless multiple executions of pg_config.

Modified Files:
--------------
    pgsql/contrib/btree_gist:
        Makefile (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/btree_gist/Makefile.diff?r1=1.7&r2=1.8)
    pgsql/contrib/chkpass:
        Makefile (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/chkpass/Makefile.diff?r1=1.6&r2=1.7)
    pgsql/contrib/cube:
        Makefile (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/Makefile.diff?r1=1.13&r2=1.14)
    pgsql/contrib/dbase:
        Makefile (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/dbase/Makefile.diff?r1=1.7&r2=1.8)
    pgsql/contrib/dblink:
        Makefile (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/dblink/Makefile.diff?r1=1.9&r2=1.10)
    pgsql/contrib/dbmirror:
        Makefile (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/dbmirror/Makefile.diff?r1=1.4&r2=1.5)
    pgsql/contrib/earthdistance:
        Makefile (r1.15 -> r1.16)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/earthdistance/Makefile.diff?r1=1.15&r2=1.16)
    pgsql/contrib/fulltextindex:
        Makefile (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/fulltextindex/Makefile.diff?r1=1.13&r2=1.14)
    pgsql/contrib/fuzzystrmatch:
        Makefile (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/fuzzystrmatch/Makefile.diff?r1=1.5&r2=1.6)
    pgsql/contrib/intagg:
        Makefile (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intagg/Makefile.diff?r1=1.5&r2=1.6)
    pgsql/contrib/intarray:
        Makefile (r1.11 -> r1.12)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/Makefile.diff?r1=1.11&r2=1.12)
    pgsql/contrib/isbn_issn:
        Makefile (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/isbn_issn/Makefile.diff?r1=1.13&r2=1.14)
    pgsql/contrib/lo:
        Makefile (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/lo/Makefile.diff?r1=1.13&r2=1.14)
    pgsql/contrib/ltree:
        Makefile (r1.3 -> r1.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/contrib/mSQL-interface:
        Makefile (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/mSQL-interface/Makefile.diff?r1=1.9&r2=1.10)
    pgsql/contrib/oid2name:
        Makefile (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/oid2name/Makefile.diff?r1=1.7&r2=1.8)
    pgsql/contrib/pg_buffercache:
        Makefile (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_buffercache/Makefile.diff?r1=1.1&r2=1.2)
    pgsql/contrib/pg_trgm:
        Makefile (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_trgm/Makefile.diff?r1=1.2&r2=1.3)
    pgsql/contrib/pgbench:
        Makefile (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgbench/Makefile.diff?r1=1.13&r2=1.14)
    pgsql/contrib/pgcrypto:
        Makefile (r1.22 -> r1.23)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgcrypto/Makefile.diff?r1=1.22&r2=1.23)
    pgsql/contrib/pgstattuple:
        Makefile (r1.3 -> r1.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pgstattuple/Makefile.diff?r1=1.3&r2=1.4)
    pgsql/contrib/seg:
        Makefile (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/seg/Makefile.diff?r1=1.12&r2=1.13)
    pgsql/contrib/spi:
        Makefile (r1.25 -> r1.26)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/spi/Makefile.diff?r1=1.25&r2=1.26)
    pgsql/contrib/tablefunc:
        Makefile (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tablefunc/Makefile.diff?r1=1.4&r2=1.5)
    pgsql/contrib/tips:
        Makefile (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tips/Makefile.diff?r1=1.7&r2=1.8)
    pgsql/contrib/tsearch2:
        Makefile (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/Makefile.diff?r1=1.9&r2=1.10)
    pgsql/contrib/tsearch2/ispell:
        Makefile (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/ispell/Makefile.diff?r1=1.7&r2=1.8)
    pgsql/contrib/tsearch2/snowball:
        Makefile (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/snowball/Makefile.diff?r1=1.6&r2=1.7)
    pgsql/contrib/tsearch2/wordparser:
        Makefile (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/wordparser/Makefile.diff?r1=1.6&r2=1.7)
    pgsql/contrib/userlock:
        Makefile (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/userlock/Makefile.diff?r1=1.18&r2=1.19)
    pgsql/contrib/vacuumlo:
        Makefile (r1.14 -> r1.15)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/vacuumlo/Makefile.diff?r1=1.14&r2=1.15)
    pgsql/contrib/xml2:
        Makefile (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/xml2/Makefile.diff?r1=1.5&r2=1.6)
    pgsql/src/tutorial:
        Makefile (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tutorial/Makefile.diff?r1=1.18&r2=1.19)