Updated mail/cyrus24 to 2.4.18

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Cyrus IMAP 2.4.18 Release Notes
  -  Security fix: handle urlfetch range starting outside message range
  -  A bunch of cleanups and fixes to compiling
  -  A bunch of sieve cleanups
  -  Enhanced SSL/TLS configuration options
  -  Disable use of SSLv2/SSLv3
  -  Allow SQL backend for mboxlist and statuscache (thanks Julien Coloos)
  -  Fixed Task #116: correct LIST response for domains starting with ¡Æinbox.¡Ç
  -  Fixed Task #76: fixed lmtpd userdeny db checks (thanks Leena Heino)
  -  Fixed bug #3856: lmtpd now performs userdeny checks
  -  Fixed bug #3848: support charset aliases in encoded headers
  -  Fixed bug #3853: disconnect_on_vanished_mailbox: release mailbox lock
     before exiting (thanks Wolfgang Breyha)
  -  Fixed bug #3415: fixed nntpd LIST/GROUP bug
  -  Fixed bug #3784: no longer crash in THREAD REFERENCES when messages
     reference themselves
  -  Fixed bug #3757: don¡Çt segfault on mailbox close with no user

New ssl/tls configuration options
    tls_compression: 0
        Enable TLS compression. Disabled by default.

    tls_eccurve: prime256v1
        Select the elliptic curve used for ECDHE.

    tls_prefer_server_ciphers: 0
        Prefer the cipher order configured on the server-side.

    tls_versions: tls1_0 tls1_1 tls1_2
        Disable SSL/TLS protocols not in this list.

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