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/html/m_image.cpp

@@ -289,7 +289,7 @@ public:
                     wxFSFile *input, int w = wxDefaultCoord, int h = wxDefaultCoord,
                     double scale = 1.0, int align = wxHTML_ALIGN_BOTTOM,
                     const wxString& mapname = wxEmptyString);
-    ~wxHtmlImageCell();
+    virtual ~wxHtmlImageCell();
     void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
               wxHtmlRenderingInfo& info);
     virtual wxHtmlLinkInfo *GetLink(int x = 0, int y = 0) const;