message: ignore change in the filter_utxo function
diff: @@ -520,7 +520,7 @@ pub extern "C" fn wallet_filter_utxos(input_ptr: *const c_uchar, input_sz: usize
  let input : FeeStabilisationInput = input_json!(output_ptr, input_ptr, input_sz);
  let algo = tx::fee::LinearFee::default();
  - let (fee, selection) = jrpc_try!(
  + let (fee, selection, _) = jrpc_try!(
  output_ptr,
  algo.compute(input.selection_policy, &input.inputs, &input.outputs, &input.change_addr, &input.fee_addr)
  );
  