libarchive: merge from vendor branch

Libarchive 3.7.0

Important changes (relevant to FreeBSD):
#1814 Do not account for NULL terminator when comparing with "TRAILER!!!"
#1818 Add ability to produce multi-frame zstd archives
#1840 year 2038 fix for pax archives on platforms with 64-bit time_t
#1860 Make single bit bitfields unsigned to avoid clang 16 warning
#1869 Fix FreeBSD builds with WARNS=6
#1873 bsdunzip ported to libarchive from FreeBSD
#1894 read support for zstd compression in 7zip archives
#1918 ARM64 filter support in 7zip archives

MFC after: 2 weeks
PR: 272567 (exp-run)

MFV r357783:
Update libarchive to 3.4.2

Relevant vendor changes:
PR #1289: atomic extraction support (bsdtar -x --safe-writes)
PR #1308: big endian fix for UTF16 support in LHA reader
PR #1326: reject RAR5 files that declare invalid header flags
Issue #987: fix support 7z archive entries with Delta filter
Issue #1317: fix compression output buffer handling in XAR writer
Issue #1319: fix uname or gname longer than 32 characters in pax writer
Issue #1325: fix use after free when archiving hardlinks in ISO9660 or XAR
Use localtime_r() and gmtime_r() instead of localtime() and gmtime()

X-MFC-With: r356212,r356365,r356416
MFC after: 1 week

MFV r310115,310184:

Sync libarchive with vendor.

Vendor bugfixes (relevant to FreeBSD):
PR 830, 831, 833: Spelling fixes
OSS-Fuzz 227, 230, 239: Fix possible memory leak in archive_read_free()
OSS-Fuzz 237: Fix heap buffer overflow when reading invalid ar archives

MFC after: 1 week