...as well as !riscv64...

NB: IIRC the order was important somehow
so I put the meta-arch before the specific one;
*if* this is correct, then the code handling
the list is not completely correct (or at least
this behaviour has to be documented); not ready
to debug those regexes at the moment though.

antohami: It's not, it's been fixed:
https://lists.altlinux.org/pipermail/devel-distro/2021-December/002674.html