Creates an in-program ONC RPC client for the remote program
    prognum, version versnum. The transport used to pass messages
    to the service is actually a buffer within the process's address
    space, so the corresponding server should live in the same
    address space; see svcraw_create. This allows simulation of
    and acquisition of ONC RPC overheads, such as round-trip times,
    without any kernel interference.