pgsql: Still more third thoughts: when linking shared libraries, LDFLAGS

Log Message:
-----------
Still more third thoughts: when linking shared libraries, LDFLAGS probably
needs to appear before anything placed in SHLIB_LINK. This is because
SHLIB_LINK is typically a subset of LIBS, and LIBS has to appear after
LDFLAGS on platforms that are sensitive to the relative order of -L and -l
switches.

Modified Files:
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pgsql/src:
Makefile.shlib (r1.124 -> r1.125)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.shlib?r1=1.124&r2=1.125)