1. wxGrid fixes contributed by Gerhard Gruber (client data for cells...)

2. Motif warnings removed
3. Using native msgbox under Motif (ok, it doesn't work, but generic doesn't
   work neither)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2930 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/motif/utils.cpp

@@ -75,7 +75,7 @@ void wxFlushEvents()
     Display *display = (Display*) wxGetDisplay();
 
     XSync (display, FALSE);
-    XEvent event;
+
     // XtAppPending returns availability of events AND timers/inputs, which
     // are processed via callbacks, so XtAppNextEvent will not return if
     // there are no events. So added '& XtIMXEvent' - Sergey.