Fix the examples

examples/window.rs

@@ -9,15 +9,10 @@ mod support;
 #[cfg(target_os = "android")]
 android_start!(main);
 
-#[cfg(not(feature = "window"))]
-fn main() { println!("This example requires glutin to be compiled with the `window` feature"); }
-
-#[cfg(feature = "window")]
 fn resize_callback(width: u32, height: u32) {
     println!("Window resized to {}x{}", width, height);
 }
 
-#[cfg(feature = "window")]
 fn main() {
     let mut window = glutin::WindowBuilder::new().build().unwrap();
     window.set_title("A fantastic window!");