adapting the MSW way for mutex gui

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26916 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/app.cpp

@@ -1124,6 +1124,9 @@ void wxApp::MacHandleOneEvent( WXEVENTREF evr )
         MacHandleUnhandledEvent(evr);
     }
     wxMacProcessNotifierAndPendingEvents() ;
+#if wxUSE_THREADS
+    wxMutexGuiLeaveOrEnter();
+#endif // wxUSE_THREADS
 }
 
 long wxMacTranslateKey(unsigned char key, unsigned char code) ;