crypto/rand, internal/syscall/unix: use simpler random seed on NetBSD
sysctl kern.arandom has been supported since NetBSD 4.0, works inside a
chroot, has no confusing bells and whistles like Linux getrandom,
requires no complicated querying to avoid SIGSYS traps, and is what
NetBSD 10 will usee for the getentropy(3) library routine soon to
appear in POSIX.
Change-Id: I23bd84ecd5ff3e33e8958c60896db842c44667ba
GitHub-Last-Rev:
5db094c85ae14bbd9f80247d46d90e00061187cc
GitHub-Pull-Request: golang/go#61441
Reviewed-on: https://go-review.googlesource.com/c/go/+/511036
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>