Provide builds for various Linux distros

[jimeh]

This is a decent bit off, as it first requires a build script for Linux.

The build-emacs-for-macos script used at the moment is macOS specific for
obvious reasons. But I am planning a rewrite of it in Go, which allow me more
flexibility, potentially opening the door for Linux support without too much
effort. Time will tell.

[jimeh]

Very minor update on some movement for Linux builds. I recently needed a nightly build of Emacs on a linux machine, and put together a very quick and dirty bash script. It did what I needed, but not much more.

It did inspire me to start putting some proper effort into a solution for Linux however, and as of now, I have made a start in a new repo (jimeh/evm). Once it gets to a working state, the outstanding tasks would be to to decide and implement a means of packaging the builds for various, yet to be determined, Linux distros.