Rename our 'task_spawn' to 'task_spawn_cmd' since NuttX now has its own version of task_spawn that's different.

src/examples/fixedwing_control/main.c

@@ -528,7 +528,7 @@ int ex_fixedwing_control_main(int argc, char *argv[])
 		}
 
 		thread_should_exit = false;
-		deamon_task = task_spawn("ex_fixedwing_control",
+		deamon_task = task_spawn_cmd("ex_fixedwing_control",
 					 SCHED_DEFAULT,
 					 SCHED_PRIORITY_MAX - 20,
 					 2048,

src/examples/px4_daemon_app/px4_daemon_app.c

@@ -91,7 +91,7 @@ int px4_deamon_app_main(int argc, char *argv[])
 		}
 
 		thread_should_exit = false;
-		deamon_task = task_spawn("deamon",
+		deamon_task = task_spawn_cmd("deamon",
 					 SCHED_DEFAULT,
 					 SCHED_PRIORITY_DEFAULT,
 					 4096,