Log Message:
Update cyrus-imapd24 to 2.4.17.

Changes to the Cyrus IMAP Server since 2.4.16

      * A bunch of cleanups and fixes to compiling
      * A bunch of sieve cleanups
      * Fixed bug #3691: unixhierarchysep is now obeyed when printing the
        mailbox name in unexpunge
      * Fixed bug #3718: crashes fetching message parts
      * Fixed bug #3719: pop3 seen update of final message in a mailbox
      * Improved documentation of "proxyservers" option
      * Fixed bug #3737: lost emails in XFER delivery race
      * Fixed bug #3725: inefficient statuscache use in some cases
      * Fixed bug #3484: use of sasl property types (compile fix)
      * Fixed bug #3754: failure to support binary append. This was found
        by a popular library switching to using binary appends
      * Fixed bug #3735: user prefix searching now works with fulldirhash
      * Fixed bug #3696: can no longer rename the same mailbox twice, which
        left things in a corrupted state if you caught the race.
      * Fixed bug #3715: using berkeley for mailboxes.db was very broken.
        It now works.
      * Fixed bug #3733: reconstruct with missing cyrus.index will use file
        timestamps for internaldate rather than setting it to NOW if
        internaldate_heuristic is set to standard
      * Fixed bug #3729: better documentation for xlist-* in 2.4.
      * Fixed bug #2717: fetches of individual messages or short ranges no
        longer need to parse over the entire index.
      * Fixed bug #3742: reconstruct can now fix multiple folders with the
        same uniqueid again (regression from 2.3) and also sync_client
        avoids a crash in that broken case.
      * Fixed bug #3711: detect the buggy /usr/bin/compile_et shipped on
        MacOS X and fall back to our bundled copy.