Integrate the keyboard layout for my Ergodox EZ, which is a layout for
QMK, with the depot, including exposing several cross-compilation
packages necessary to compile qmk for avr in third_party.
Change-Id: Idd43169a0a3cf0be2bd1a578fdaff70388a58bfc
Reviewed-on: https://cl.tvl.fyi/c/depot/+/947
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>