stmhal: Update for static mod sys.
diff --git a/py/modsys.c b/py/modsys.c
index 7f8cd68..59539b3 100644
--- a/py/modsys.c
+++ b/py/modsys.c
@@ -23,9 +23,11 @@
{ MP_OBJ_NEW_QSTR(MP_QSTR_path), (mp_obj_t)&mp_sys_path_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_argv), (mp_obj_t)&mp_sys_argv_obj },
+#if MICROPY_MOD_SYS_STDFILES
{ MP_OBJ_NEW_QSTR(MP_QSTR_stdin), (mp_obj_t)&mp_sys_stdin_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_stdout), (mp_obj_t)&mp_sys_stdout_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_stderr), (mp_obj_t)&mp_sys_stderr_obj },
+#endif
};
STATIC const mp_obj_dict_t mp_module_sys_globals = {