Just to ensure this is portable across all platforms.

Credits go to https://github.com/graphitemaster/incbin, bits of the
.incbin code were taken from there. Thanks!

Reland of https://crrev.com/c/881181

Bug: v8:6666
Change-Id: I5c0dbf56b1c987fd88607dca69b39d65b59cdefc
Reviewed-on: https://chromium-review.googlesource.com/895597
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51042}