Include header file in implementation module. Declarations of public functions was in header files, but header files was not included in implementation file.

UTIL: Create new wraper header file sss_endian.h Some platform have header file endian.h and anothers have sys/endian.h. We nedd to use conditional build to handle it correctly, therefore new header file sss_endian.h was created.

Fix compilation on older little-endian systems

murmurhash: Relax inline requirement

util: Fix murmurhash3 on machines with old glibc

util: add murmurhash3 hash function