This package is only used by tests anyway, but might as well
remove the cgo use on macOS so that it doesn't show up as
a cgo user, as part of our overall strategy to remove cgo use
in the standard library on macOS.
Change-Id: I5a1a39ed56373385f9d43a5e17098035dc1a451a
Reviewed-on: https://go-review.googlesource.com/c/go/+/449315
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
