Change privilege model for mac_partition such that BSD superuser can change the partition once a partition has been set.  This is required for correct operation of sendmail between partitions.
Change privilege model for mac_partition such that BSD superuser can change
the partition once a partition has been set.  This is required for correct
operation of sendmail between partitions.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories

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