pgsql: On some HPUX versions/hardware, it seems we need to include

Log Message:
-----------
On some HPUX versions/hardware, it seems we need to include libgcc.a in
the regression test shared libraries.

Modified Files:
--------------
pgsql/src/makefiles:
Makefile.hpux (r1.26 -> r1.27)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/makefiles/Makefile.hpux.diff?r1=1.26&r2=1.27)