Give restricted gold tests executable bit. Bug: angleproject:4090 Bug: b/168049670 Change-Id: Ie3a46d4689e40958460c1f26a228645d84b3305c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2423211 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>