Fixup Blit so it can be used with a source that is a wxBufferedDC,

since wxBufferedDC doesn't derive from wxMemoryDC any more.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41965 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/dc.h

@@ -95,6 +95,7 @@ public:
     virtual void ComputeScaleAndOrigin();
 
     virtual GdkWindow* GetGDKWindow() const { return NULL; }
+    virtual wxBitmap GetSelectedBitmap() const { return wxNullBitmap; }        
 
 protected:
     // implementation