include/starpu_task.h: make ABI independant on whatever is available

include/starpu_task.h

@@ -61,10 +61,8 @@ enum starpu_task_status
 	STARPU_TASK_FINISHED,
 	STARPU_TASK_BLOCKED_ON_TAG,
 	STARPU_TASK_BLOCKED_ON_TASK,
-	STARPU_TASK_BLOCKED_ON_DATA
-#ifdef STARPU_OPENMP
-	, STARPU_TASK_STOPPED
-#endif
+	STARPU_TASK_BLOCKED_ON_DATA,
+	STARPU_TASK_STOPPED
 };
 
 typedef uint64_t starpu_tag_t;