CLSA-2024-1731341580 Fix CVE(s): CVE-2002-27759, CVE-2020-27754, CVE-2020-27759

SECURITY UPDATE: Potential overflow in IntensityCompare function in quantize.c - debian/patches/CVE-2020-27754.patch: fix pixel intensity comparison in quantize.c to avoid integer overflow - debian/patches/CVE-2020-27759.patch: fix IntensityCompare function to correctly calculate intensity...