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We still need the wrapper to set the env and to filter out ' Assembling: foo',
but less wrapper is probably better.

No intended behavior change.

Bug: none
Change-Id: Id8c165294cc3cf0ba7fc74f86a6a8fb9f8bfa042
Reviewed-on: https://chromium-review.googlesource.com/c/1303883Reviewed-by: Scott Graham <scottmg@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603533}