Merge branch 'fix_opengl_on_mac' into yubo

code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp

@@ -1584,11 +1584,13 @@ void	registerGlExtensions(CGlExtensions &ext)
 {
 	H_AUTO_OGL(registerGlExtensions);
 
+#ifdef NL_OS_MAC
 	CGLContextObj ctx = CGLGetCurrentContext();
 	if (ctx == NULL)
 	{
 		nlerror("No OpenGL context set");
 	}
+#endif
 
 	// OpenGL 1.2 ??
 	const char	*nglVersion = (const char *)glGetString (GL_VERSION);