py/objtype: Make mp_obj_type_t.flags constants public, moved to obj.h.

py/obj.h

@@ -444,6 +444,10 @@ typedef mp_obj_t (*mp_fun_var_t)(size_t n, const mp_obj_t *);
 // this arg to mp_map_lookup().
 typedef mp_obj_t (*mp_fun_kw_t)(size_t n, const mp_obj_t *, mp_map_t *);
 
+// Flags for type behaviour (mp_obj_type_t.flags)
+#define MP_TYPE_FLAG_IS_SUBCLASSED (0x0001)
+#define MP_TYPE_FLAG_HAS_SPECIAL_ACCESSORS (0x0002)
+
 typedef enum {
     PRINT_STR = 0,
     PRINT_REPR = 1,