The listunspent RPC has been modified so that it also returns witnessScript,
the witness script in the case of a P2WSH or P2SH-P2WSH output.
The signrawtransactionwithkey and signrawtransactionwithwallet RPCs have been
modified so that they also optionally accept a witnessScript, the witness script in the
case of a P2WSH or P2SH-P2WSH output. This is compatible with the change to listunspent.