Neither ppc64le nor loongarch64 use vendor kernels, so the old GCCs
packages are not required.
They currently don't build either because of a couple of problems when
building with GCC 15. If we really want to, ppc64le can be re-enabled
once those problems are resolved, since it is supported since GCC 4.9.
loongarch64 needs a much newer GCC.
[ci:skip-vercheck]
Signed-off-by: Jens Reidel <adrian@postmarketos.org>
Part-of: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7117
[ci:skip-build]: just disabling some arches