Log Message:
Update DBMail to 2.2.8.
While here, pkglint clean and add DESTDIR support.

This is strictly a maintenance release. No new functionality was added.

Changes since 2.2.8-rc1
none

Bugs fixed since 2.2.7
0000655: [Database layer] MIME headers are incorrectly parsed into cached tables \ 
(paul)
0000656: [Command-Line programs (dbmail-users, dbmail-util)] dbmail-export: \ 
bogus date in "From_" lines (paul)