lz4: updated to 1.9.3

LZ4 v1.9.3 is a maintenance release, offering more than 200+ commits to fix multiple corner cases and build scenarios. Update is recommended. Existing liblz4 API is not modified, so it should be a drop-in replacement.

Changes list

Here is a more detailed list of updates introduced in v1.9.3 :

perf: highly improved speed in kernel space, by @terrelln
perf: faster speed with Visual Studio, thanks to @wolfpld and @remittor
perf: improved dictionary compression speed, by @felixhandte
perf: fixed LZ4_compress_HC_destSize() ratio, detected by @hsiangkao
perf: reduced stack usage in high compression mode, by @Yanpas
api : LZ4_decompress_safe_partial() supports unknown compressed size, requested by @jfkthame
api : improved LZ4F_compressBound() with automatic flushing, by Christopher Harvie
api : can (de)compress to/from NULL without UBs
api : fix alignment test on 32-bit systems (state initialization)
api : fix LZ4_saveDictHC() in corner case scenario, detected by @IgorKorkin
cli : compress multiple files using the legacy format, by Filipe Calasans
cli : benchmark mode supports dictionary, by @rkoradi
cli : fix --fast with large argument, detected by @picoHz
build: link to user-defined memory functions with LZ4_USER_MEMORY_FUNCTIONS
build: contrib/cmake_unofficial/ moved to build/cmake/
build: visual/* moved to build/
build: updated meson script, by @neheb
build: tinycc support, by Anton Kochkov
install: Haiku support, by Jerome Duval
doc : updated LZ4 frame format, clarify EndMark

(adam)