These are being dropped by Nixpkgs itself soon in the near future, with
few users (on top of reduced usage of our flake/cache). We also already
have coverage for macOS builds through the aarch64-darwin target, so
this doesn't have a big impact on our end either
Obviously can be reverted if enough people want it
Signed-off-by: Seth Flynn <getchoo@tuta.io>
698e1dd7cf