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The nacl-gcc toolchain no longer runs on recent version of MacOS.
Coverage of the glibc toolchain's use of the Pepper ABIs will continue
on Linux/Win.

Change-Id: Id60229cfde0fca368a28f708994b26c479326606
Bug: 1013169
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888723Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711087}