Support dynamic queue (queue_t) arguments

[trbauer]

Support queue_t arguments.

A custom queue can be created as follow.

cl_queue_properties qprop[] = {CL_QUEUE_SIZE, 16*1024*1024, 
                               CL_QUEUE_PROPERTIES,         
  (cl_command_queue_properties)CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE |
                               CL_QUEUE_ON_DEVICE |
                               CL_QUEUE_ON_DEVICE_DEFAULT, 0};   
cl_command_queue my_device_q = clCreateCommandQueueWithProperties(CLU_CONTEXT, cluGetDevice(CL_DEVICE_TYPE_GPU), qprop, &status);

See https://software.intel.com/en-us/articles/sierpinski-carpet-in-opencl-20