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This function is now used to zip the remoting installer on mac. That
zip contains a .sh script that the build server extracts and tries to
run, so make sure it remains executable after unpacking.

Bug: 875279,870611
Change-Id: Ia515a997f9d67943daa8e09907b52ec070650de2
Reviewed-on: https://chromium-review.googlesource.com/c/1301793
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603088}