This should catch potential build file misconfigurations.

Change-Id: I1bd1f808a4758e0d3b71c862cfc34e7b01e6fbd9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2827894
Auto-Submit: Dan Elphick <delphick@chromium.org>
Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73976}