[PATCH] libc++: add NaCl and PNaCl support for std::random_device

[JF Bastien]

> The purpose of the token is to permit different sources of randomness.
Seeing as how you don't allow anything other than
`nacl_secure_random_init`, perhaps you should just make the default token
be the empty string in the `<random>` header.

That would be a breaking change if we do decide to support other sources of
randomness. What we have now emulates the token it accepts (its POSIX
meaning), so it's the right thing IMO.
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