tell Google3 we do not need executable stack

Change-Id: I5ff3599448d027fcac43a53e98a801ce672ce5ee
Reviewed-on: https://skia-review.googlesource.com/10861
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
2 files changed