clamav: security bump to version 0.98.5

Fixes:
CVE-2013-6497 - the jwplayer.js file causes ClamAV to seg fault when
scanned with the -a (list archived files).

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>