CLSA-2024-1730919625 Fix CVE(s): CVE-2020-27773, CVE-2020-27775

SECURITY UPDATE: Integer overflow vulnerability in gem-private.h - debian/patches/CVE-2020-27773.patch: fix gamma calculation to prevent division by zero in ConvertLuvToXYZ function - CVE-2020-27773 SECURITY UPDATE: Undefined behaviour in quantum.h - debian/patches/CVE-2020-27775.patch: fix...