Interface fixes for Phoenix

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72143 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dcbuffer.h

@@ -154,6 +154,13 @@ public:
 };
 
 
+/**
+ * Check if the window is natively double buffered and will return a wxPaintDC
+ * if it is, a wxBufferedPaintDC otherwise.  It is the caller's responsibility
+ * to delete the wxDC pointer when finished with it.
+ */
+wxDC* wxAutoBufferedPaintDCFactory(wxWindow* window);
+
 
 /**
     @class wxBufferedPaintDC