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

src/common/variant.cpp

@@ -60,7 +60,7 @@ DECLARE_DYNAMIC_CLASS(wxVariantDataList)
 public:
     wxVariantDataList() {}
     wxVariantDataList(const wxList& list);
-    ~wxVariantDataList();
+    virtual ~wxVariantDataList();
 
     wxList& GetValue() { return m_value; }
     void SetValue(const wxList& value) ;