make access specifiers for the virtual functions match their access in the base class (patch 1400131)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37393 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/enhmeta.h

@@ -86,9 +86,10 @@ public:
     // obtain a pointer to the new metafile (caller should delete it)
     wxEnhMetaFile *Close();
 
-private:
+protected:
     virtual void DoGetSize(int *width, int *height) const;
 
+private:
     // size passed to ctor and returned by DoGetSize()
     int m_width,
         m_height;