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/os2/palette.h

@@ -22,7 +22,7 @@ class WXDLLEXPORT wxPaletteRefData: public wxGDIRefData
     friend class WXDLLEXPORT wxPalette;
 public:
     wxPaletteRefData();
-    ~wxPaletteRefData();
+    virtual ~wxPaletteRefData();
 // protected:
     WXHPALETTE                      m_hPalette;
     HPS                             m_hPS;
@@ -42,7 +42,7 @@ public:
               ,const unsigned char* pGreen
               ,const unsigned char* pBlue
              );
-    ~wxPalette();
+    virtual ~wxPalette();
 
     bool Create( int                  n
                 ,const unsigned char* pRed