CVE-2026-46522: add the missing length==0 checks to the MIFF
decoder BZ2/LZMA/zlib decompression paths to reject empty
compressed chunks and prevent an infinite loop (CPU exhaustion)
on crafted files
CVE-2026-46523: mark the MSL coder as not supporting direct blob
I/O (entry->blob_support=MagickFalse in RegisterMSLImage) to
prevent a heap-use-after-free triggered by a crafted MSL image