fastlz: Libraries included for kernel compression from fastlz project.

Added source code of fastlz from fastlz.org.

The original library is written in C, but it was also C++ compatible,
hence in this patch I added as a C++ source code and without
preprocessor and extern "C" code.

Signed-off-by: Eduardo Piva <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>

Author: efpiva