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

[JF Bastien]

Return ENOENT instead of ENODEV as suggested by @majnemer.

http://reviews.llvm.org/D6442

Files:
  include/__config
  include/random
  src/random.cpp
  test/numerics/rand/rand.device/ctor.pass.cpp
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