almalinux-release defines the %centos macro (%centos %{major}), so the
upstream spec's `%if 0%{?centos} == 0` test treats AlmaLinux as CentOS
and sets portablesuffix to el9. AlmaLinux must consume the el8 portable
packages (like RHEL), so the previous action was NOT obsolete — dropping
it left the "Set portablesuffix to el8" changelog with nothing setting it.
Re-add the `%if 0%{?almalinux}` -> el8 override, anchored on the stable
`%global portablebuilddir /builddir/build/BUILD` line (matching the a10s
and a10 branch configs) instead of the fragile portablesuffix/%endif anchor.
