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.

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