mail/exim: upgrade to 4.77
New stuff (from ftp://exim.inode.at/exim/ChangeLogs/NewStuff-4.77):
1. New options for the ratelimit ACL condition: /count= and /unique=.
The /noupdate option has been replaced by a /readonly option.
2. The SMTP transport's protocol option may now be set to "smtps", to
use SSL-on-connect outbound.
3. New variable $av_failed, set true if the AV scanner deferred; ie, when
there is a problem talking to the AV scanner, or the AV scanner running.
4. New expansion conditions, "inlist" and "inlisti", which take simple lists
and check if the search item is a member of the list. This does not
support named lists, but does subject the list part to string expansion.(Only the first 15 lines of the commit message are shown above )