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/mac/carbon/dataobj.h

@@ -21,7 +21,7 @@ class WXDLLEXPORT wxDataObject : public wxDataObjectBase
 public:
     wxDataObject();
 #ifdef __DARWIN__
-    ~wxDataObject() { }
+    virtual ~wxDataObject() { }
 #endif
 
     virtual bool IsSupportedFormat( const wxDataFormat& format, Direction dir = Get ) const;