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/lw.h

@@ -61,6 +61,7 @@ typedef struct {
 extern "C" {
 #endif
 
+#if wxUSE_GLCANVAS
 int       lw_is_lwobject(const char     *lw_file);
 lwObject *lw_object_read(const char     *lw_file);
 void      lw_object_free(      lwObject *lw_object);
@@ -68,6 +69,7 @@ void      lw_object_show(const lwObject *lw_object);
 
 GLfloat   lw_object_radius(const lwObject *lw_object);
 void      lw_object_scale (lwObject *lw_object, GLfloat scale);
+#endif
 
 #ifdef __cplusplus
 }