package/clamav: security bump version to 0.101.4

Fixes CVE-2019-12900 and adds an additional fix for CVE-2019-12625.

Release notes:
https://blog.clamav.net/2019/08/clamav-01014-security-patch-release-has.html



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