Add folly::kahan_sum and folly::accurate_sum to folly/math

Guard VdsoGetcpu test to x86/x86-64 architectures only

Fix undefined behavior in BitIterator::operator= (placement new on this)

Remove unused folly/ScopeGuard.h include from SysUio.cpp

Fix 2 flaky tests

convert checksum to fb_dirsync_cpp_library

convert checksum_detail to fb_dirsync_cpp_library

convert init to fb_dirsync_cpp_library

convert exception to fb_dirsync_cpp_library

convert test_ext to fb_dirsync_cpp_library

Remove unused #include <limits> from RangeSse42.cpp

add exported_headers dict support to fb_dirsync_cpp_library + convert iobuf_lib

FNFPlayer compiling for AppleTV

Fix highs-optimizer getdeps manifest for Linux and Windows CI

Fix tarfile.extractall path traversal vulnerability