adds error codes from extensions and future OpenCL versions.
adds error codes from extensions and future OpenCL versions.

JuliaPackageMirrors/OpenCL.jl,tkelman/OpenCL.jl,yuyichao/OpenCL.jl,tkelman/OpenCL.jl,JuliaPackageMirrors/OpenCL.jl,yuyichao/OpenCL.jl