[issue29157] random.c: Prefer getrandom() over getentropy(), handle ENOSYS in py_getentropy()

[Christian Heimes]

Christian Heimes added the comment:

I'm doing a review now.

By the way I did not copy random.c for cryptography. I took bits and pieces out of it. https://github.com/pyca/cryptography/blob/master/src/_cffi_src/openssl/src/osrandom_engine.c and https://github.com/pyca/cryptography/blob/master/src/_cffi_src/openssl/src/osrandom_engine.h

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<http://bugs.python.org/issue29157>
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