disable color in emerge output

If the default settings enable color, then this parsing fails.

BUG=None
TEST=build_image still works when emerge defaults to color output

Change-Id: I3c5be726d22362cd5b96e3bb89327525e0194e48
Reviewed-on: https://chromium-review.googlesource.com/382791
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
1 file changed