Function librdkafka_sys::rd_kafka_conf_set_dr_msg_cb

pub unsafe extern "C" fn rd_kafka_conf_set_dr_msg_cb(
    conf: *mut rd_kafka_conf_t, 
    dr_msg_cb: Option<unsafe extern "C" fn(_: *mut rd_kafka_t, _: *const rd_kafka_message_t, _: *mut c_void)>
)