Log Message:
update clamav to 0.88.1.

changes since 0.88:

  * Bugfixes:
    - libclamav/matcher.c: properly handle partial reads in cli_scandesc()
    - libclamav/mbox.c: sync with CVS, fixes detection of Worm.Bagle.CT
    - freshclam: fix support for LocalIPAddress
      Patch by Anton Yuzhaninov <citrin*citrin.ru>
    - docs/man: multiple manpage typo fixes
      Patch by A. Costa <agcosta*gis.net>)
    - shared/output.c: properly handle return value of vsnprintf
      Thanks to Anton Yuzhaninov <citrin*rambler-co.ru>
    - libclamav/htmlnorm.c: fix typo spotted by Gianluigi Tiesi
      <sherpya*netfarm.it>
    - sigtool/sigtool.c: fix possible crash in build(), thanks to Sven
    - clamd/session.c: remove static timeout (5s) for SESSION
      Pointed out by Joseph Benden <joe*thrallingpenguin.com>
    - libclamav/pe.c: fix possible integer overflow reported by Damian Put
      Note: only exploitable if file size limit (ArchiveMaxFileSize) disabled
    - libclamav/scanners.c: properly report archive unpacking errors
      Problem spotted by David F. Skoll <dfs*roaringpenguin.com>
    - libclamav/others.c: fix possible crash in cli_bitset_test()
      Reported by David Luyer <david_luyer*pacific.net.au>
    - libclamav/zziplib: fix possible crash on FreeBSD
      Reported by Robert Rebbun <robert*desertsurf.com>
    - clamav-milter: fall back if sendfile() fails