added multisampling (anti-aliasing) support to wxGLCanvas (#9145)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54022 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/glcanvas.h

@@ -141,10 +141,11 @@ protected:
     // HDC for this window, we keep it all the time
     HDC m_hDC;
 
+    void wxGLCanvas::DestroyWindowPFD(wxWindow *parent);
+
 private:
     DECLARE_EVENT_TABLE()
     DECLARE_CLASS(wxGLCanvas)
 };
 
 #endif // _WX_GLCANVAS_H_
-