Make tests/main/wait_all_regenerable_tasks.c work with OpenCL.

tests/main/wait_all_regenerable_tasks.c

@@ -42,9 +42,9 @@ static void dummy_func(void *descr[] __attribute__ ((unused)), void *arg __attri
 
 static struct starpu_codelet dummy_codelet = 
 {
-	.where = STARPU_CPU|STARPU_CUDA,
 	.cpu_funcs = {dummy_func, NULL},
 	.cuda_funcs = {dummy_func, NULL},
+	.opencl_funcs = {dummy_func, NULL},
 	.model = NULL,
 	.nbuffers = 0
 };