We aren't currently building py3 wheels for this platform (and to this
point, they haven't been requested).

Change-Id: I9528fed0816ea90c802c72d0d07afa3e88a1f5a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3158558
Auto-Submit: Brian Ryner <bryner@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>