Log Message:
Update cyrus-imapd to 2.4.8.

Changes to the Cyrus IMAP Server since 2.4.7

      * Bug #3428 - allow charset argument to "thread" to be quoted
      * Bug #3429 - fixed mupdate crash
      * Bug #3404 - had crept back in! Fix LIST "" user properly
      * Bug #3388 - fix reconstruct internaldate flap when file hardlinked
        with different internaldates
      * Bug #3410 - don't require a partition on murder frontends
      * Bug #3406 - fix compile on FreeBSD
      * Bug #3415 - fix nntpd
      * Bug #3390 - add 'proc_path' config variable
      * Bug #3364 - allow setting unlimited quota through a proxy server
      * Bug #3433 - append '0.' file rather than deleting in reconstruct
      * Fixed bug in reconstruct where a record rewrite lost the cache
        pointer until you did a SECOND reconstruct (no bug number)
      * Bug #3440 - fixed cyr_expire crash if run with -x