STL-ification patch for wxMSW and wxGTK.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21876 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dataobj.h

@@ -260,6 +260,7 @@ class WXDLLEXPORT wxDataObjectComposite : public wxDataObject
 public:
     // ctor
     wxDataObjectComposite();
+    virtual ~wxDataObjectComposite();
 
     // add data object (it will be deleted by wxDataObjectComposite, hence it
     // must be allocated on the heap) whose format will become the preferred