Mistake introduced just before submitting CL 67650 that somehow
did not break a final pre-submit all.bash on my laptop.

Not sure why all.bash passes locally when mkdeps.go doesn't build.
I guess the test only runs on builders?

Change-Id: I18fb91ada47605035345ba4b2f5e360a5c4b7f6e
Reviewed-on: https://go-review.googlesource.com/67850
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>