The updates we had in the past (7719f7f and 1faf610) broke the mdadm
installer test and systems in the wild using mdraid because newer mdadm
versions contained a self-referenc to its own store path.
Instead of putting a big warning about updating in the package
expression, let's just add allowedReferences so the build immediately
fails if there is a self-reference.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
011c149ed5