Done using:

  go get golang.org/x/sys/unix@latest
  go mod tidy

Updates golang/go#27532

Change-Id: Ibb984f35d969b4f93a492f24560bc957f9dafb65
Reviewed-on: https://go-review.googlesource.com/c/net/+/217359


Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>