Don't bother calculating digests of %ghost %config files
- Calculating digest of %ghost config is useless as there's nothing
to compare the result to. Also we never take backups of %ghost
configuration anyway, so this is a total waste of time. One common
case of %ghost %config is the rpmdb (environment and all) which
can be rather large and calculating digests can take several seconds,
only for the results to be thrown away unused.
- There are some cases where it might be reasonable to back up %ghost
%config (eg if it gets replaced by non-config), but
rpmfiConfigConflictIndex() doesn't have sufficient context to figure
that out. For now, preserve the traditional simple rule: no backups
for ghosts, ever.