[buildpkg] create chroot for multilib

Created by: manjaro

As of now if we create lib32 packages we have to recreate x86_64 chroot. Else we would have normal gcc and not gcc-multilib. I would rather create a chroot called multilib for that case.

Created by: udeved

This is already possible. Just specify multilib for arch, it will pull in multilib devel depends.

Created by: manjaro

I know that, but it creates a chroot called x86_64 and not multilib. I simply expected to have: /opt/buildpkg/unstable/multilib/

Created by: udeved

Ah, ok, so its just naming issue. Will change it.

Created by: udeved

Should work with this: https://github.com/manjaro/manjaro-tools/commit/8d8c0299cb1cd88094cd68735bc30c2d5f4cf963

Reopen if required please.