Make sure to update the mtime of a logfile after archiving it. This ensures that the next rotation happens at the correct time when using interval-based rotations.
Make sure to update the mtime of a logfile after archiving it. This
ensures that the next rotation happens at the correct time when using
interval-based rotations.

PR:		bin/174438
Reviewed by:	gad
Approved by:	rstone (co-mentor)
MFC after:	1 week

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