GN should understand action outputs, so the header generated by the
run_torque action do not need to be separately listed in another
source_set.

Change-Id: I309e8c012eb0a0597a247806d36658c1d6e5d97b
Reviewed-on: https://chromium-review.googlesource.com/c/1297680Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56953}