Use a single source dir for the drivers and drivers-initfs recipes

See merge request !374

This makes it easier to make driver changes. And in the future other
recipes could potentially benefit from the same infrastructure too.

Remove a bunch of recipes and convert one to wip

See merge request !375

Fix apache-httpd and apr recipes to build properly and to use epoll by default in apr.

See merge request !378

It doesn't compile anymore as one of it's dependencies uses a removed
rustc feature.

Glium is no longer actively maintained.