Build repos that have external repo with merge mode "bare" have missing archful RPMs on armhfp and i386 arhes, while aarch64, ppc64le, s390x and x86_64 seem to be unaffected.

Reproducible in Fedora production Koji:

• tag: https://koji.fedoraproject.org/koji/taginfo?tagID=14245
• external repo: https://koji.fedoraproject.org/koji/externalrepoinfo?extrepoID=34
• newRepo task: https://koji.fedoraproject.org/koji/taskinfo?taskID=38667710
• resulting repo: https://kojipkgs.fedoraproject.org/repos/module-maven-3.6-3120191030181542-de40bf8e-build/1289839/

Reproducer:

for arch in aarch64 armhfp i386 ppc64le s390x x86_64; do
  echo == $arch ==
  dnf -q --repofrompath test-$arch,https://kojipkgs.fedoraproject.org/repos/module-maven-3.6-3120191030181542-de40bf8e-build/1289839/$arch/ --repo test-$arch repoquery | sed s/.*\\.// | sort | uniq -c
done

Actual output:

== aarch64 ==
  20937 aarch64
  27259 noarch
== armhfp ==
  27259 noarch
== i386 ==
  27259 noarch
== ppc64le ==
  27259 noarch
  20673 ppc64le
== s390x ==
  27259 noarch
  20249 s390x
== x86_64 ==
  27259 noarch
  21281 x86_64

As can be seen from the above output, armhfp and i386 repos have only noarch packages in them, archful RPMs are missing.