@buildsys-build needs to rely on fedora-release-common
    
    Attempting to install @buildsys-build atop a Workstation, Server or
    other edition/spin using a fedora-release-$VARIANT package resulted
    in a conflict because @buildsys-build unconditionally required
    fedora-release. We will change it to fedora-release-common which
    is guaranteed to be present (and will pull in fedora-release, in
    the case of a clean buildroot).
    
    Resolves: rhbz#1728863
    
    Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>