fix build bustage due to gkconxsldoc_s no longer existing after landing of bug 185797

layout/html/tests/Makefile.in

@@ -60,7 +60,6 @@ LIBS		= \
 		$(DIST)/lib/$(LIB_PREFIX)gkconxmldoc_s.$(LIB_SUFFIX) \
 		$(DIST)/lib/$(LIB_PREFIX)gkxulbase_s.$(LIB_SUFFIX) \
 		$(DIST)/lib/$(LIB_PREFIX)gkconshared_s.$(LIB_SUFFIX) \
-		$(DIST)/lib/$(LIB_PREFIX)gkconxsldoc_s.$(LIB_SUFFIX) \
 		$(MOZ_JS_LIBS) \
 		$(EXTRA_DSO_LIBS) \
 		$(TK_LIBS) \