unix: don't fail TestSelect on EINTR from Select
unix: don't fail TestSelect on EINTR from Select

Change-Id: Ie162966c830ffd86947cf4f04532a7f6741a5587
Reviewed-on: https://go-review.googlesource.com/c/sys/+/207861
Run-TryBot: Tobias Klauser <0a68dd4915066ec5d3f81f75a828fee53dcc8822@gmail.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

golang/sys,multiplay/golang-sys,multiplay/golang-sys,golang/sys,multiplay/golang-sys,multiplay/golang-sys,golang/sys