unix: sync with SunOS 5.11 kernel

Change-Id: If732030e7ed8f1ba4ce09d4efc5b132d5f48fd8a
Reviewed-on: https://go-review.googlesource.com/43210
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
3 files changed