add 4 io

hc

2023-08-21 ef9e1ccebba20d2e3859126411166909a383f483

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#
# Copyright (c) 2015 Google, Inc
#
# SPDX-License-Identifier:    GPL-2.0+
#
 
obj-y += cmd_dhry.o dhry_1.o dhry_2.o