[issue26798] add BLAKE2 to hashlib

[Christian Heimes]

Christian Heimes added the comment:

New patch:

- I moved the test vectors out of the repos. They are currently hosted on github. I'll move them to pythontest infra later.

- I dropped special case for systems w/o uint64. Python 3.6+ requires 64 bit int types to compile.

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Added file: http://bugs.python.org/file43106/BLAKE2-hash-algorithm-for-CPython-3.patch

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