want arc4random(3C) suite
The arc4random suite of routines come from OpenBSD and provide a high random userland PRNG. Third-party software is coming to expect these routines such as newer versions of NTP, libressl, bind, etc. This implements the functions in libc, along with other related routines.
As a part of this we're importing DJB's chacha code which is used in the implementation of arc4random.