run.bash: run misc/cgo/testgodefs/test.bash

misc/cgo/testgodefs was added by revision d1cf884a594f, but not
add to run.bash.

LGTM=iant
R=iant
CC=golang-codereviews
https://codereview.appspot.com/129760044

Committer: Ian Lance Taylor <iant@golang.org>