devel/ocl-icd: Fix build after devel/opencl update

ocl-icd comes with a copy of Khrono's OpenCL headers. ocl-icd hasn't been
updated since 8/2021, the copy of OpenCL headers is outdated and results in a
compile error while compiling the port with most recent OpenCL headers 3.0.14
provided by Khronos.
The patch simply provides withj the correct

CONFIGURE_ARGS=--enable-official-khronos-headers

to ensure the pickup of devel/opencl headers.

PR: 271255
Reported by: leres@
Fixes: 0eb6406f6594