Fix libmodulemd requirements
Requiring `libmodulemd` was incorrect, as that is the 2.x API,
which rpkg is not yet compatible with. This was working by
coincidence because libmodulemd1 is usually on most systems and
thus this would succeed to install and run, but the proper dep
here is on libmodulemd1 which provides the 1.x API being used by
rpkg.
Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>
Merges: https://src.fedoraproject.org/rpms/rpkg/pull-request/31