fixed CopyFromBitmap() for shared wxIcon objects by adding CloneRefData() implementation (patch 1026453)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29099 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/icon.h

@@ -96,6 +96,8 @@ protected:
         return new wxIconRefData;
     }
 
+    virtual wxObjectRefData *CloneRefData(const wxObjectRefData *data) const;
+
     // create from XPM data
     void CreateIconFromXpm(const char **data);