Make legacy functions crash on osx core contexts

examples/fullscreen.rs

@@ -35,6 +35,7 @@ fn main() {
     };
 
     let window = glutin::WindowBuilder::new()
+        .with_gl_profile(glutin::GlProfile::Compatibility)
         .with_title("Hello world!".to_string())
         .with_fullscreen(monitor)
         .build()