Log Message:
Security update to version 0.88.4

Changes:
- libclamav/upx.c: fix possible heap overflow
  See http://www.clamav.net/security/0.88.4.html for details.
- libclamav/tnef.c: handle trailing newline at the end of winmail.dat,
  bug reported by Menno Smits <menno*netboxblue.com>
- freshclam/manager.c: fix possible infinite loop when read() fails
  in get_database(), spotted by Everton da Silva Marques
  <everton*lab.ipaccess.diveo.net.br>