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/palmos/metafile.h

@@ -30,7 +30,7 @@ class WXDLLEXPORT wxMetafileRefData: public wxGDIRefData
     friend class WXDLLEXPORT wxMetafile;
 public:
     wxMetafileRefData();
-    ~wxMetafileRefData();
+    virtual ~wxMetafileRefData();
 
 public:
     WXHANDLE m_metafile;