[issue26798] add BLAKE2 to hashlib

[Christian Heimes]

Christian Heimes added the comment:

First experimental version of blake2b and blake2s for Python 3.6:
https://github.com/tiran/cpython/commits/feature/blake2

The code is based on Dmitry Chestnykh's pyblake2 but modified to support argument clinic. I had to replace the macro magic with plain C code. The clinic is not able to deal with the macros. blake2s.c is auto-generated from blake2b.c

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26798>
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