revert some key code to pre branch landing so that typing works correctly

widget/src/gtk/nsGtkEventHandler.cpp

@@ -751,7 +751,8 @@ gint handle_key_press_event(GtkWidget *w, GdkEventKey* event, gpointer p)
   //  character code.  Note we have to check for modifier keys, since
   // gtk returns a character value for them
   //
-#ifdef USE_XIM
+// XXX this doesn't work, so s/USE_XIM_NOT/USE_XIM/ when this works again
+#ifdef USE_XIM_NOT
   if (event->length) {
     static nsIUnicodeDecoder *decoder = nsnull;
     if (!decoder) {