These were added to support specific cross-compile scenarios that
should now be covered by the --target-os and --target-arch flags.

Bug: v8:9103
Change-Id: I848f4f39cecc83f9ec8529c4f8855662059e3dc5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1624219
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61787}