Windows icon loading broken since glutin 0.20

[chrisduerr]

I've just bisected the downstream issue alacritty/alacritty#2260 in Alacritty and noticed that an update to glutin 0.20 has broken Icon support on Windows.

This is specifically about the with_window_icon call. I haven't been able to test this on X11 myself yet.

I've bisected winit and it turns out 7be1d16 is the culprit.

[Osspial]

Thanks for the report! I'll look into what's causing this.