hgignore: ignore run.out generated by misc/cgo/stdio/test.bash

R=golang-dev, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/5757059

.hgignore

@@ -26,6 +26,7 @@ test.out
 doc/tmpltohtml
 doc/codelab/wiki/*.bin
 misc/cgo/life/run.out
+misc/cgo/stdio/run.out
 misc/dashboard/builder/gobuilder
 misc/goplay/goplay
 misc/osx/*.pkg