Specification for cl_khr_extended_versioning (#218) * Specification for cl_khr_extended_versioning Signed-off-by: Kevin Petit <[email protected]> Change-Id: Ibe017baa7b8f0a24f9294aaabae4efeaadb43055 * address obvious review comments Change-Id: I44ef74894f3f0a77b226e4e123d3b917ec4518eb * remove enum values Change-Id: If3aab0711f3645936bb74dec4c0fd32773551c1f