rcld: Check whether certain OpenCL features are supported

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
rcld: introduce OpenCL utility kernels

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>
rcld: Add feature CL_FEATURE_CORE

Signed-off-by: Pawel Dziepak <pdziepak@quarnos.org>