mail/dovecot-pigeonhole: upgrade to v0.4.22.

Changelog:
- Fixed filesystem path handling problem: sieve plugin could have
  assert-crashed with specific path lengths with: "Panic: file
  realpath.c: line 86 (path_normalize): assertion failed: (npath_pos +
  1 < npath + asize)".
- Sieve extprograms plugin: Large output from "execute" command crashed
  delivery. Fixed buffering issue in code that handles output from the
  external program.
- editheader extension: Extensively reworked the low-level
  implementation of adding and removing headers. This solves a few
  integer arithmetic problems reported by Clang runtime checks, but also
  improves code structure and reliability in general.
- imapsieve: Fix assert crash occurring when selected messages are
  expunged concurrently by the time Sieve filter is to be applied.
- imap4flags extension: Fix binary byte-code corruption occurring when
  the setflag, addflag, or removeflag command's flag-list is a variable.
- enotify extension: mailto method: Fixed parsing of mailto URI with
  only a header part.
- enotify extension: mailto method: Make sure "From:" header is set to a
  usable address and not "(null)".
- Fixed writing address headers to outgoing messages. It sometimes
  erroneously applied another layer of MIME header encoding.

mail/dovecot-pigeonhole/Makefile

@@ -2,8 +2,7 @@
 # $FreeBSD$
 
 PORTNAME=	dovecot-pigeonhole
-PORTVERSION=	0.4.21
-PORTREVISION=	2
+PORTVERSION=	0.4.22
 CATEGORIES=	mail
 MASTER_SITES=	http://pigeonhole.dovecot.org/releases/${DOVECOTVERSION}/
 DISTNAME=	${PORTNAME:C/-/-${DOVECOTVERSION}-/}-${PORTVERSION}

mail/dovecot-pigeonhole/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1507842786
-SHA256 (dovecot-2.2-pigeonhole-0.4.21.tar.gz) = 4ae09cb788c5334d167f5a89ee70b0616c3231e5904ad258ce408e4953cfdd6a
-SIZE (dovecot-2.2-pigeonhole-0.4.21.tar.gz) = 1774887
+TIMESTAMP = 1520013525
+SHA256 (dovecot-2.2-pigeonhole-0.4.22.tar.gz) = 5b288d99ced946261d8d70ed2f8bad3dec02d07faa132d046036df0216046f0f
+SIZE (dovecot-2.2-pigeonhole-0.4.22.tar.gz) = 1778176