libxxhash: Update to version 0.8.3 and make available to rsync

libxxhash: Update to version 0.8.3 and make available to rsync

- Update from version 0.8.2 to 0.8.3
- Update of rootfile
- Move libxxhash to before rsync in make.sh
- Changelog
    0.8.3
	- fix  : variant `XXH3_128bits_withSecretandSeed()` could produce an invalid
	  result in some specific set of conditions, #894 by @hltj
	- cli  : vector extension detected at runtime on x86/x64, enabled by default
	- cli  : new commands `--filelist` and `--files-from`, by @Ian-Clowes
	- cli  : XXH3 64-bits GNU format can now be generated and checked (command `-H3`)
	- portability: LoongArch SX SIMD extension, by @lrzlin
	- portability: can build on AIX, suggested by @likema
	- portability: validated for SPARC cpus

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