Log Message:
Update lz4 to r123.

r123:
Added : experimental lz4frame API, thanks to Takayuki Matsuoka and
  Christopher Jackson for testings
Fix : s390x support, thanks to Nobuhiro Iwamatsu
Fix : test mode (-t) no longer requires confirmation, thanks to Thary Nguyen

r122:
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:
Added : Makefile : install for kFreeBSD and Hurd (Nobuhiro Iwamatsu)
Fix : Makefile : install for OS-X and BSD, thanks to Takayuki Matsuoka