CLSA-2023-1697016696 Fix CVE(s): CVE-2023-4863, CVE-2023-4836

SECURITY UPDATE: Heap buffer overflow - debian/patches/CVE-2023-4863-pre.patch: prepare sources to be patched - debian/patches/CVE-2023-4863-1.patch: first, BuildHuffmanTable is called to check if the data is valid. If it is and the table is not big enough, more memory is allocated. This will mak...