link against libs we actually use

fix from upstream

http://bugs.gentoo.org/145652

--- src/Makefile.in
+++ src/Makefile.in
@@ -55,7 +55,7 @@
 am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(includedir)"
 libLTLIBRARIES_INSTALL = $(INSTALL)
 LTLIBRARIES = $(lib_LTLIBRARIES)
-librpcsecgss_la_LIBADD =
+librpcsecgss_la_LIBADD = $(GSSAPI_LIBS)
 am_librpcsecgss_la_OBJECTS = auth_gss.lo authgss_prot.lo svc.lo \
 	svc_run.lo svc_auth.lo svc_auth_none.lo svc_auth_unix.lo \
 	svc_auth_gss.lo svc_raw.lo svc_simple.lo svc_tcp.lo svc_udp.lo \