unix: add GetsockoptTCPInfo

Change-Id: I190098a4a969a706c555e48d2ad938d41017601e
Reviewed-on: https://go-review.googlesource.com/39195
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
1 file changed