void silc_packet_stream_set_iv_included(SilcPacketStream stream);

    Sets an IV Included property for the stream indicated by `stream'.
    This means that the IV used in the encryption will be included in
    the resulted ciphertext.  This makes it possible to send and receive
    packets on unreliable network transport protocol, such as UDP/IP.
    This must be called if the underlaying stream in the `stream' is UDP
    stream.

    When this is set to the stream the silc_packet_set_sid must be called
    to set new Security ID.  The Security ID will be included with the IV
    in the ciphertext.