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The hermetic mac toolchain currently uses Xcode 8. Xcode 8 does not run on macOS
10.14+.

Bug: 904400
Change-Id: I79afe5563631aac5c608c6ef57b594ae5de81e73
Reviewed-on: https://chromium-review.googlesource.com/c/1331907
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607420}