c/files.pm: Add testing of no multiarch old lib dir

/lib32 /lib64 /libx32 and their /usr counterparts are obsolete.

Signed-off-by: Niels Thykier <niels@thykier.net>
Does not allow /emul

Multiarch used /emul. Now it does not need /emul so warm about it.

Signed-off-by: Niels Thykier <niels@thykier.net>