Do not clean up thread structures in decompression failure
conditions, fixing a use-after-free in lzma_decompress_buf() and a
NULL pointer dereference in ucompthread() on corrupt/malicious
archives (CVE-2025-15570, boo#1258016; CVE-2025-15571, boo#1258023)
Handle -L given without a parameter, fixing a NULL pointer
dereference (CVE-2025-9396, boo#1248598)
Add write bounds checking in libzpaq and sanity checks for
maliciously encoded headers and oversized allocations
Various STDIO, portability and build fixes (OpenBSD support,
non-x86 zpaq, autoconf warnings); drop Doxygen doc build