don't clear clipboard if it was changed by another application since we used it (patch 1436601)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37935 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/clipbrd.h

@@ -89,7 +89,7 @@ public:
     void UsePrimarySelection( bool WXUNUSED(primary) = false ) { }
 
 private:
-    bool m_clearOnExit;
+    IDataObject *m_lastDataObject;
     bool m_isOpened;
 };