[PATCH] [lib/Fuzzer] Add SHA1 implementation from public domain.

[Kostya Serebryany]

Hi chandlerc,

This adds a SHA1 implementation taken from public domain code.
The change is trivial, but as it involves third-party code I'd like
a second pair of eyes before commit.

LibFuzzer can not use SHA1 from openssl because openssl may not be available
and because we may be fuzzing openssl itself.
Using sha1sum via a pipe is too slow.

http://reviews.llvm.org/D9733

Files:
  lib/Fuzzer/CMakeLists.txt
  lib/Fuzzer/FuzzerInternal.h
  lib/Fuzzer/FuzzerSha1.cpp
  lib/Fuzzer/FuzzerUtil.cpp

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