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

[STINNER Victor]

STINNER Victor added the comment:

Python 2.7, 3.5, 3.6 and 3.7 are impacted: they should fail on Linux if compiled with a recent glibc which has getentropy().

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29157>
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