CHROMIUM: output build failures immediately

Our old wrapper would dump failure logs immediately.  The new
wrapper doesn't dump logs at all when run in parallel except
for one scenario: if there's exactly one failure, it will be
shown at the end.

Change the output to show immediately when a failure is hit so
our builders can produce useful output for devs.

BUG=chromium:996480
TEST=ran some emerge commands and looked at their wrapping

Change-Id: Iebc6e2589f0e9ac392db398fced30f0402fee1a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/portage_tool/+/1779810
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
1 file changed