The new "unix" build tag matches any Unix or Unix-like system.
This is only recognized on go:build lines, not in file names.
For #20322
Fixes #51572
Change-Id: I3a991f9e69353b25e259bc6462709cdcd83640fb
Reviewed-on: https://go-review.googlesource.com/c/go/+/389934
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Rob Pike <r@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>