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mail/dcc-dccd: update to 2.3.164, use /var/db/dcc instead of /var/db, various…

Description

mail/dcc-dccd: update to 2.3.164, use /var/db/dcc instead of /var/db, various cleanups

PR: 220978
Submitted by: kai
Reported by: mi@ALDAN.algebra.com
Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D20155