make sure all lib entries get into libs.private in the .pc file

--- a/lib/Makefile
+++ b/lib/Makefile
@@ -61,7 +61,7 @@ $(PCILIBPC): libpci.pc.in
 		-e 's,@LIBDIR@,$(LIBDIR),' \
 		-e 's,@IDSDIR@,$(IDSDIR),' \
 		-e 's,@VERSION@,$(VERSION),' \
-		-e 's,@LDLIBS@,$(LDLIBS),'
+		-e 's,@LDLIBS@,$(LDLIBS) $(LIB_LDLIBS),'
 
 init.o: init.c $(INCL)
 access.o: access.c $(INCL)