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

[STINNER Victor]

STINNER Victor added the comment:

Thanks Nick and Xiang for the review. I splitted again the giant change into small atomic changes, easier to review and understand.

Right now, I only applied the change to default (Python 3.7). I will now wait for buildbots before considering backporting the change.

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