Some package updates

[nanoant]

I have managed to fix some small package problems, update few existing, and introduce couple of interesting ones :) LLVM and Clang updates are still on my list, also I am planning to introduce qemu.

[lloeki]

Super cool. I think I have qemu locally somewhere but it's hackishly packaged.

Also, a quick note: .install scripts that run info tools seem to not work correctly and output failures on install (GNU stuff, e.g bash), I was set on just dropping the info part of those.

[nanoant]

Okay, having python3-sphinx running was biggest PITA (hell lot of new deps), but it works. At least I am able to build cmake docs and LLVM build fine in my private branch (that one is not ready to merge yet). Not I am reaving everywhere a reference to original package, e.g.:

# Ported from Arch Linux:
# https://git.archlinux.org/svntogit/packages.git/plain/trunk/PKGBUILD?h=packages/python-chardet

So it can be easily differ and updated.

[nanoant]

Alright, I finally finished porting Clang 9.0.0 (see last commit in this PR). /opt/arch/bin/clangd now works with SublimeText on my Mac, see last commit in this PR.

[lloeki]

Cool, thanks.

I've done some serious work on my side to move to GitHub Actions on Catalina due to CircleCi pricing changes. Also basically rebuilt and updated many things locally. I'll do a PR but I need to produce a new base snapshot.

So I won't merge this in a little while til the above is complete.