nixos manual: Fix instruction for getting booted kernel confix
elixir: bump to 0.15.1
Merge pull request #3643 from daogames/tb/update-elixir

elixir: bump to 0.15.1
Merge pull request #3637 from nathanielbaxter/dev/nixos_manual

nixos manual: Fix instruction for getting booted kernel confix
chromium: Fix build

This works around ld-wrapper's --sysroot filter not working on '@'
command lines.

Fixes #3642.
firmware-linux-nonfree: 0.41 -> 0.43
speedtest-cli: 0.2.7 -> 0.3.1
Merge pull request #3648 from wkennington/master.speedtest

speedtest-cli: 0.2.7 -> 0.3.1