Add basic collections.namedtuple implementation.
diff --git a/py/builtin.h b/py/builtin.h
index e49e839..85ceeaf 100644
--- a/py/builtin.h
+++ b/py/builtin.h
@@ -32,4 +32,6 @@
 MP_DECLARE_CONST_FUN_OBJ(mp_builtin_sum_obj);
 MP_DECLARE_CONST_FUN_OBJ(mp_builtin_str_obj);
 
+MP_DECLARE_CONST_FUN_OBJ(mp_namedtuple_obj);
+
 void mp_module_micropython_init(void);