[Bug 194204] getentropy(2): sys call from openbsd

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194204

--- Comment #5 from Mateusz Guzik <mjg at FreeBSD.org> ---
I'm no crypto expert.

Turns out FreeBSD's arc4rand uses RC4, while OpenBSD's version uses something
based on ChaCha which is stronger than RC4.

I don't think we should provide a syscall with weaker randomness than one
provided with original implementation.

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