mail/p5-Sendmail-PMilter: New port: Perl bindings for Sendmail/Postfix milter interface

The original Sendmail::Milter (mail/p5-Sendmail-Milter) is not really
maintained, there's more up to date module Sendmail::PMilter:
https://metacpan.org/dist/Sendmail-PMilter

Latest version of bogofilter-milter require it:
https://stuff.mit.edu/~jik/software/bogofilter-milter/

PR: 281354