package/clamav: security bump to version 0.99.4

Fixes CVE-2012-6706, CVE-2017-6419, CVE-2017-11423, CVE-2018-1000085 &
CVE-2018-0202.

For details see upstream announcement:
http://lists.clamav.net/pipermail/clamav-announce/2018/000029.html

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2 files changed