CLSA-2022-1642087622 Fix CVE(s): CVE-2021-4192, CVE-2021-4193

SECURITY UPDATE: Using freed memory with /%V - debian/patches/CVE-2021-4192.patch: Get the line again after getvvcol - CVE-2021-4192 SECURITY UPDATE: Going beyond the end of the line with /%V - debian/patches/CVE-2021-4193.patch: Check for valid column in getvcol - CVE-2021-4193...