lz4: Update to 1.9.3

lz4: Update to 1.9.3

- Update lz4 from 1.9.2 to 1.9.3
- Updated rootfile
- Removed old patches and updated to new version name
- Changelog
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 : `-l` legacy format is now compatible with `-m` multiple files, 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, suggested by Yuriy Levchenko
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

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>