lz4: update to version 122

Makefile md5sum changed its is where they bump the version.

r122 fixes:
Fix : AIX & AIX64 support (SamG)
Fix : mips 64-bits support (lew van)
Added : Examples directory, using code examples from Takayuki Matsuoka
Updated : Framing specification, to v1.4.1
Updated : xxHash, to r36

r121 fixes:
Fix : make install for OS-X and BSD, thanks to Takayuki Matsuoka
Added : make install for kFreeBSD and Hurd (Nobuhiro Iwamatsu)
Fix : LZ4 HC streaming bug

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>