py/builtinimport: Disable "imported as namespace package" warning.

Namespace packages are natural part of Python3, CPython3 doesn't have such
warning, it made sense only from point of view of Python2 legacy.

py/builtinimport.c

@@ -462,7 +462,7 @@ mp_obj_t mp_builtin___import__(size_t n_args, const mp_obj_t *args) {
                     vstr_add_str(&path, "__init__.py");
                     if (mp_import_stat_any(vstr_null_terminated_str(&path)) != MP_IMPORT_STAT_FILE) {
                         vstr_cut_tail_bytes(&path, sizeof("/__init__.py") - 1); // cut off /__init__.py
-                        mp_warning("%s is imported as namespace package", vstr_str(&path));
+                        //mp_warning("%s is imported as namespace package", vstr_str(&path));
                     } else {
                         do_load(module_obj, &path);
                         vstr_cut_tail_bytes(&path, sizeof("/__init__.py") - 1); // cut off /__init__.py