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/dialog.h

@@ -45,7 +45,7 @@ public:
             const wxSize &size = wxDefaultSize,
             long style = wxDEFAULT_DIALOG_STYLE,
             const wxString &name = wxDialogNameStr );
-    ~wxDialog() {}
+    virtual ~wxDialog() {}
 
     virtual bool Show( bool show = TRUE );
     virtual int ShowModal();