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/x11/dcmemory.h

@@ -21,12 +21,13 @@ public:
     wxMemoryDC( wxDC *dc ); // Create compatible DC
     ~wxMemoryDC();
     virtual void SelectObject( const wxBitmap& bitmap );
-    void DoGetSize( int *width, int *height ) const;
 
     // implementation
     wxBitmap  m_selected;
 
-private:
+protected:
+    void DoGetSize( int *width, int *height ) const;
+
     DECLARE_DYNAMIC_CLASS(wxMemoryDC)
 };