pgsql: Fix unwanted side-effects of recent SHLIB_LINK -L patch on

Log Message:
-----------
Fix unwanted side-effects of recent SHLIB_LINK -L patch on existing
hacking of SHLIB_LINK for HPUX.

Modified Files:
--------------
pgsql/src:
Makefile.shlib (r1.94 -> r1.95)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/Makefile.shlib.diff?r1=1.94&r2=1.95)