oops... fatal bug (which I recently introduced) with uninit callback corrected

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2087 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/menu.cpp

@@ -442,12 +442,14 @@ void wxMenu::ProcessCommand(wxCommandEvent & event)
 {
     bool processed = FALSE;
 
+#if WXWIN_COMPATIBILITY
     // Try a callback
     if (m_callback)
     {
         (void)(*(m_callback))(*this, event);
         processed = TRUE;
     }
+#endif // WXWIN_COMPATIBILITY
 
     // Try the menu's event handler
     if ( !processed && GetEventHandler())