CL: sync C headers with Khronos

https://github.com/KhronosGroup/OpenCL-Headers at commit
0d5f18c6e7196863bc1557a693f1509adfcee056

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
3 files changed