update Lz4 v1.9.4

[ChristianSchindler]

update to Lz4 v1.9.4 #124 https://github.com/lz4/lz4/releases/tag/v1.9.4

OLD:

./lzbench -r -v -elz4 silesia
Compressor name         Compress. Decompress. Compr. size  Ratio Filename
memcpy                  50470 MB/s 51045 MB/s    10192446 100.00 silesia/dickens
lz4 1.9.3                 423 MB/s  3599 MB/s     6428742  63.07 silesia/dickens
lz4 1.9.3                 674 MB/s  3488 MB/s    26435667  51.61 silesia/mozilla
lz4 1.9.3                 657 MB/s  4273 MB/s     5440937  54.57 silesia/mr
lz4 1.9.3                1156 MB/s  5414 MB/s     5533040  16.49 silesia/nci
lz4 1.9.3                 579 MB/s  3718 MB/s     4338918  70.53 silesia/ooffice
lz4 1.9.3                 617 MB/s  3990 MB/s     5256666  52.12 silesia/osdb
lz4 1.9.3                 408 MB/s  3036 MB/s     3181387  48.00 silesia/reymont
lz4 1.9.3                 688 MB/s  4229 MB/s     7716839  35.72 silesia/samba
lz4 1.9.3                 642 MB/s  5461 MB/s     6790273  93.63 silesia/sao
lz4 1.9.3                 478 MB/s  3439 MB/s    20139988  48.58 silesia/webster
lz4 1.9.3                 921 MB/s  4390 MB/s     1227495  22.96 silesia/xml
lz4 1.9.3                1800 MB/s 15951 MB/s     8390195  99.01 silesia/x-ray

NEW:

 ./lzbench -r -v -elz4 silesia
Compressor name         Compress. Decompress. Compr. size  Ratio Filename
memcpy                  51145 MB/s 50659 MB/s    10192446 100.00 silesia/dickens
lz4 1.9.4                 419 MB/s  3694 MB/s     6428742  63.07 silesia/dickens
lz4 1.9.4                 680 MB/s  3574 MB/s    26435667  51.61 silesia/mozilla
lz4 1.9.4                 666 MB/s  4348 MB/s     5440937  54.57 silesia/mr
lz4 1.9.4                1151 MB/s  5555 MB/s     5533040  16.49 silesia/nci
lz4 1.9.4                 577 MB/s  3721 MB/s     4338918  70.53 silesia/ooffice
lz4 1.9.4                 616 MB/s  4113 MB/s     5256666  52.12 silesia/osdb
lz4 1.9.4                 419 MB/s  3139 MB/s     3181387  48.00 silesia/reymont
lz4 1.9.4                 712 MB/s  4381 MB/s     7716839  35.72 silesia/samba
lz4 1.9.4                 641 MB/s  5143 MB/s     6790273  93.63 silesia/sao
lz4 1.9.4                 479 MB/s  3612 MB/s    20139988  48.58 silesia/webster
lz4 1.9.4                 929 MB/s  4523 MB/s     1227495  22.96 silesia/xml
lz4 1.9.4                1829 MB/s 15189 MB/s     8390195  99.01 silesia/x-ray