Log Message:
Update to 2.0. From the changelog:

- Added support for modifying the message envelope as well as the body.

- If either the body or envelope output is empty, the input is reused
  as-is.

- Export the envelope size, the message size, and the number of
  recipients to filters through environment variables $ENVSIZE,
  $MSGSIZE, and $NUMRCPTS respectively.

pkgsrc changes:

* As suggested by the install docs, use a temporary directory
    writable only by user qmaild (the user as whom qmail-qfilter
    typically runs). This can be changed by setting QMAIL_QFILTER_TMPDIR
    in mk.conf.

* Find the qmail-queue binary even if QMAILDIR isn't "/var/qmail".

* Add dependency on bglibs.