If we fail in chown(2), try to just change the group and continue on to change the permissions.  Failures are still recorded.
If we fail in chown(2), try to just change the group and continue on to
change the permissions.  Failures are still recorded.

This allows mtree to do a generally better job of things when uid != 0.

Sponsored by:		ActiveState/Sophos
Partially submitted by:	neilw at ActiveState dot com
Reviewed by:		neilw at ActiveState dot com
MFC after:		3 weeks

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