Log Message:
Update mimedefang to 3.3. Main changes from 2.78:
        * add is_public_ip6_address to check if an ipv6 address
	  is local
        * add md_authres method to generate a basic Authentication-Results
          header for the message
        * add md_arc_sign method to sign email messages
          with DKIM ARC signatures
        * add md_dkim_verify method to verify DKIM signatures
        * add md_dkim_sign method to sign email messages
          with DKIM signatures
        * add anonymize_uri to remove utm_* parameters
          from uris.
        * split mimedefang.pl code in Perl modules
        * add re_match_in_7zip_directory to check for files
          inside 7zip archives
        * fallback to plaintext when md_check_against_smtp_server
          fails SSL connection for unknown reasons
        * add experimental support to scan emails with Rspamd antispam
        * Obtain the Queue-ID as early as possible in the SMTP
          session. Requires the "-y" command-line option to mimedefang.
        * mimedefang.pl: Add support for a configuration file
          to separate data from code
        * mimedefang.pl: Add support to scan messages for viruses on a remote
          Clamav server using clamdscan client.
        * mimedefang.pl: Add re_match_in_rar_directory function to match
          unwanted file names extensions inside a rar archive file.
        * mimedefang.pl: Added TLS support to md_check_against_smtp_server
        * mimedefang-multiplexor: Make "workerinfo nnn" show how long ago
          the last state change was for a given worker.
        * mimedefang.pl: Do not add a Message-ID: header when handing a
          message to SpamAssassin if the original message lacks such a
          header.
        * Add a new -V maxLifetime option to mimedefang-multiplexor that
          terminates worker processes after maxLifetime seconds (approximately).
          This is in addition to the -r maxRequests option.
        * Log the lifetime and number of requests processed when we terminate
          a worker process.
        * Make mimedefang and mimedefang-multiplexor write their PID files
          as root to avoid an unprivileged user tampering with the pidfiles.
          Thanks to Michael Orlitzky for pointing this issue out.
        * mimedefang.pl: Add an extra level of subdirectories in the quarantine
          to avoid 32K subdirectory limit on ext3.  Idea by Kevin McGrail.
        * Add the --data-dump option to scripts/mimedefang-util

And various bug fixes and minor improvements.
pkgsrc changes: make the rc.d script use the new -o option and move the pid
files to $VARBASE/run/, keeping the lock and socket files in
$VARBASE/spool/MIMEdefang/