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/mgl/bitmap.h

@@ -40,7 +40,7 @@ public:
     wxMask(const wxBitmap& bitmap, const wxColour& colour);
     wxMask(const wxBitmap& bitmap, int paletteIndex);
     wxMask(const wxBitmap& bitmap);
-    ~wxMask();
+    virtual ~wxMask();
 
     bool Create(const wxBitmap& bitmap, const wxColour& colour);
     bool Create(const wxBitmap& bitmap, int paletteIndex);
@@ -77,7 +77,7 @@ public:
     wxBitmap(char **bits) { CreateFromXpm((const char **)bits); }
     wxBitmap(const wxString &filename, wxBitmapType type = wxBITMAP_TYPE_RESOURCE);
     wxBitmap(const wxImage& image, int depth = -1);
-    ~wxBitmap() {}
+    virtual ~wxBitmap() {}
     bool operator == (const wxBitmap& bmp) const;
     bool operator != (const wxBitmap& bmp) const;
     bool Ok() const;