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/gtk1/scrolbar.h

@@ -42,7 +42,7 @@ public:
            long style = wxSB_HORIZONTAL,
            const wxValidator& validator = wxDefaultValidator,
            const wxString& name = wxScrollBarNameStr );
-    ~wxScrollBar();
+    virtual ~wxScrollBar();
     int GetThumbPosition() const;
     int GetThumbSize() const;
     int GetPageSize() const;