Updated OpenCL headers Bug: angleproject:5761 Change-Id: I45e0f9a422a0dd94fec854d3387f676192e020eb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2831303 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: John Plate <jplate@google.com>