mark all dtors which are virtual because base class dtor is virtual explicitly virtual themselves

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41020 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/brush.h

@@ -24,7 +24,7 @@ public:
 
     wxBrush( const wxColour &colour, int style = wxSOLID );
     wxBrush( const wxBitmap &stippleBitmap );
-    ~wxBrush();
+    virtual ~wxBrush();
 
     bool Ok() const { return m_refData != NULL; }