Applied patch [ 802596 ] warning and error free Open GL samples

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23491 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/opengl/penguin/penguin.h

@@ -55,15 +55,19 @@ public:
 
     void OnExit(wxCommandEvent& event);
     
+#if wxUSE_GLCANVAS
     void SetCanvas( TestGLCanvas *canvas )    { m_canvas = canvas; }
     TestGLCanvas *GetCanvas()                 { return m_canvas; }
     
 private:
     TestGLCanvas*    m_canvas;
+#endif
 
     DECLARE_EVENT_TABLE()
 };
 
+#if wxUSE_GLCANVAS
+
 class TestGLCanvas: public wxGLCanvas
 {
 public:
@@ -87,3 +91,5 @@ private:
 
 #endif
 
+#endif
+