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V8 will shortly drop this script. Import our own copy in
mojo/public/tools/ and use that for mojo's build.

The concatenate-files.py script is copied, modulo license header, from
V8's tools/ directory.

Bug: v8:7624
Change-Id: I07c6a64f061c3957002ca6f2c83c7f93b3ec009d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845764Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704237}