Don't always link XIE in static builds.

Thanks to Kai Engert <kaie@netscape.com> for the patch.
Bug #184527 r=cls

config/static-config.mk

@@ -60,10 +60,15 @@ STATIC_EXTRA_LIBS	+= \
 		$(JPEG_LIBS) \
 		$(ZLIB_LIBS) \
 		$(MOZ_GDK_PIXBUF_LIBS) \
-		$(MOZ_XIE_LIBS) \
 		$(MOZ_XPRINT_LDFLAGS) \
 		$(NULL)
 
+ifeq ($(MOZ_WIDGET_TOOLKIT),xlib)
+STATIC_EXTRA_LIBS	+= \
+		$(MOZ_XIE_LIBS) \
+		$(NULL)
+endif
+
 ifdef MOZ_PSM
 STATIC_EXTRA_LIBS	+= \
 		$(NSS_LIBS) \