py: Annotate func defs with NORETURN when their corresp decls have it.

py/stackctrl.c

@@ -48,7 +48,7 @@ void mp_stack_set_limit(mp_uint_t limit) {
     MP_STATE_THREAD(stack_limit) = limit;
 }
 
-void mp_exc_recursion_depth(void) {
+NORETURN void mp_exc_recursion_depth(void) {
     nlr_raise(mp_obj_new_exception_arg1(&mp_type_RuntimeError,
         MP_OBJ_NEW_QSTR(MP_QSTR_maximum_space_recursion_space_depth_space_exceeded)));
 }