Security fix for the ALT Linux 8 package clamav version 0.99.3-alt1

0.99.3-alt1 built Jan. 30, 2018 Sergey Y. Afonin in task 198652 Jan. 28, 2018 Sergey Y. Afonin - 0.99.3 multiple CVE's, look to README - removed cve-2017-6418.patch and cve-2017-6420.patch in upstream now...