Stop warning about clCreateCommandQueue().
Stop warning about clCreateCommandQueue().

This function is deprecated in OpenCL 2.0, but the replacement is not
present in OpenCL 1.2, and we want to run on platforms that support
only 1.2.

HIPERFIT/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,diku-dk/futhark,HIPERFIT/futhark