1) change COMMENT resembling to mail/dk-milter
2) rename gentxt as mail/dk-milter installs it in the same location
3) do not install libar
4) new option to make it run as a DomainKeys verifier as well.
# 1, 2, and 3 were pointed by ache.
Submitted by: Hirohisa Yamaguchi <email@example.com> (maintainer)