Hey Guix!

Here's Alacritty 0.4.1 and many Rust dependencies that it requires
directly and transitively. I've tried to make patches in topological
order but might've screwed that order up because I had to rebase many
of them on top of master couple times.

I also cut a couple corners in that I haven't packaged all glium
version down to 0.11 because the latest glium has cyclig dev
dependencies on many of its previous versions through cgmath. I left a
todo comment though.

Also I hope I didn't messed up a patch sending workflow, it's the
first time I'm doing it this way.

Valentin