package/clamav: security bump to 0.100.2

Fixes CVE-2018-15378, CVE-2018-14680, CVE-2018-14681 & CVE-2018-14682:
http://lists.clamav.net/pipermail/clamav-announce/2018/000033.html



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>