Use arc4rand(9) on FreeBSD#112

Merged

alexcrichton merged 3 commits intorust-random:masterfrom

habnabit:freebsd-kernel-osrng

Aug 23, 2016

Commits on Jul 29, 2016

Reduce duplication in std::sys::unix::rand.
habnabit
committed

Commits on Aug 3, 2016

Use the kernel arc4rand for FreeBSD OsRng.
habnabit
committed

Commits on Aug 4, 2016

Complete the refactor.
habnabit
committed