Description of problem:
The ExclusiveArch tag value (https://src.fedoraproject.org/rpms/efi-rpm-macros/blame/efi-rpm-macros.spec?identifier=master#_8) is stored in the source rpm which pungi (the tool that creates user consumable repos) uses to filter out noarch rpm for the arches not listed.

See
...
2018-05-03 06:03:28 [DEBUG   ] Excluding (EXCLUSIVEARCH: ['aarch64', 'armv3l', 'armv4b', 'armv4l', 'armv4tl', 'armv5tejl', 'armv5tel', 'armv5tl', 'armv6hl', 'armv6l', 'armv7hl', 'armv7hnl', 'armv7l', 'athlon', 'geode', 'i386', 'i486', 'i586', 'i686', 'pentium3', 'pentium4', 'x86_64']): efi-srpm-macros-2-5.fc29.noarch.rpm
2018-05-03 06:03:28 [DEBUG   ] Excluding (EXCLUSIVEARCH: ['aarch64', 'armv3l', 'armv4b', 'armv4l', 'armv4tl', 'armv5tejl', 'armv5tel', 'armv5tl', 'armv6hl', 'armv6l', 'armv7hl', 'armv7hnl', 'armv7l', 'athlon', 'geode', 'i386', 'i486', 'i586', 'i686', 'pentium3', 'pentium4', 'x86_64']): efi-rpm-macros-2-5.fc29.noarch.rpm
...
in https://kojipkgs.fedoraproject.org/compose/rawhide/Fedora-Rawhide-20180503.n.0/logs/global/pungi.global.log

As a result the user consumable repos have broken deps for redhat-rpm-config on all non-EFI arches (there can't be %ifarched Require in noarch rpm). The situation in koji is different as it doesn't use pungi but createrepo for its buildroot repos.

I think that generally we have all *-rpm-macros packages without any ExclusiveArch/ExcludeArch tags, but they can define "foo_arches" that's later used in arch-exclusive packages (openblas-srpm-macros comes to my mind).

Version-Release number of selected component (if applicable):
efi-rpm-macros-2-6.fc29