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This will help Linux distro packagers use system toolchain.

See included README file for context.

Bug: none
Change-Id: I82a5d34ab179b5f1ab1e0cbd12c51c3871ae876c
Reviewed-on: https://chromium-review.googlesource.com/575984Reviewed-by: Brett Wilson <brettw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488698}