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This adds llvm-strip for Linux and Mac and llvm-ar for Mac. These are
needed to build Fuchsia on Mac and Linux hosts. For now, llvm-strip is
in a separate package.

Bug: 877080
Change-Id: If10284d6f76b0cf2397ccbe9d64b98abf04589d0
Reviewed-on: https://chromium-review.googlesource.com/1193949
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588084}