configs: s390x is legal host arch for s390

Signed-off-by: Dan Horák <dan@danny.cz>
configs: add F-21 configs for secondary arches

Signed-off-by: Dan Horák <dan@danny.cz>
configs: drop rawhide ppc config

Signed-off-by: Dan Horák <dan@danny.cz>
configs: update koji repo URL

Signed-off-by: Dan Horák <dan@danny.cz>
configs: add ppc64le configs

Signed-off-by: Dan Horák <dan@danny.cz>
Merge remote-tracking branch 'upstream/master'