Intel Slicing-by-8 CRC32 algorithm

WinRAR uses CRC32 function based on Intel Slicing-by-8 algorithm.

Original Intel Slicing-by-8 code is available on sourceforge.net/projects/slicing-by-8 and licensed under BSD License available at http://www.opensource.org/licenses/bsd-license.html Text of BSD license is provided below:

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