pgsql: Link libpq with libgssapi if configure finds it, as required by

Log Message:
-----------
Link libpq with libgssapi if configure finds it, as
required by at least NetBSD.

Markus Schaaf

Tags:
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REL8_3_STABLE

Modified Files:
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pgsql/src/interfaces/libpq:
Makefile (r1.159.2.2 -> r1.159.2.3)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/libpq/Makefile?r1=1.159.2.2&r2=1.159.2.3)