The new behavior is basically this:
1) Local repos are installed same as before.
2) Multilib configs are now handled only if they exist. They follow
a naming system repos-{local,remote}-ARCH-multilib.conf.
3) Remote repo files follow naming repos-remote-ARCH.conf. If that
does not exist, repos-remote.conf or repos-remote-musl.conf is
used instead (fallback).
4) Cross follows the same behavior, just without multilib.
[ci skip]
