unix: add unix.test to .gitignore
unix: add unix.test to .gitignore

Change-Id: I216a49d54bf7d9ae89a916eed0d590f786596878
Reviewed-on: https://go-review.googlesource.com/83735
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

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