Signoff shadow. Fixes always creating system groups with ID 99 (FS#16092).
Now UID/GIDs are as follows: 0-499 -> reserved for Arch packaging 500-999 -> system users/groups 1000-60000 -> general users/groups.For some reason "groupadd --system" starts adding groups at 999 and working down, but that appears an upstream decision.
Signoff both, Allan
