pgsql: Derived files that are shipped in the distribution used to be

Log Message:
-----------
Derived files that are shipped in the distribution used to be built in the
source directory even for out-of-tree builds.  They are now alsl built in
the build tree.  This should be more convenient for certain developers'
workflows, and shouldn't really break anything else.

Modified Files:
--------------
    pgsql/contrib/cube:
        Makefile (r1.22 -> r1.23)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/Makefile?r1=1.22&r2=1.23)
    pgsql/contrib/seg:
        Makefile (r1.21 -> r1.22)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/seg/Makefile?r1=1.21&r2=1.22)
    pgsql/doc/src/sgml:
        Makefile (r1.128 -> r1.129)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/Makefile?r1=1.128&r2=1.129)
    pgsql/src:
        Makefile.shlib (r1.122 -> r1.123)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.shlib?r1=1.122&r2=1.123)
    pgsql/src/backend:
        Makefile (r1.133 -> r1.134)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/Makefile?r1=1.133&r2=1.134)
    pgsql/src/backend/bootstrap:
        Makefile (r1.37 -> r1.38)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/bootstrap/Makefile?r1=1.37&r2=1.38)
    pgsql/src/backend/parser:
        Makefile (r1.50 -> r1.51)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/Makefile?r1=1.50&r2=1.51)
    pgsql/src/backend/snowball:
        Makefile (r1.7 -> r1.8)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/snowball/Makefile?r1=1.7&r2=1.8)
    pgsql/src/backend/utils/misc:
        Makefile (r1.28 -> r1.29)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/Makefile?r1=1.28&r2=1.29)
    pgsql/src/bin/psql:
        Makefile (r1.64 -> r1.65)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/Makefile?r1=1.64&r2=1.65)
    pgsql/src/interfaces/ecpg/preproc:
        Makefile (r1.144 -> r1.145)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/Makefile?r1=1.144&r2=1.145)
    pgsql/src/interfaces/libpq:
        Makefile (r1.175 -> r1.176)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/Makefile?r1=1.175&r2=1.176)
    pgsql/src/pl/plpgsql/src:
        Makefile (r1.33 -> r1.34)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/Makefile?r1=1.33&r2=1.34)