This makes failing builds print all failures, not just the first.
Successful builds, the usual case, are unaffected.
Change-Id: I8dde21e913f6715e7760b298a87f51d1b40a8789
Reviewed-on: https://skia-review.googlesource.com/67803
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>