rpcrt4: Reimplement rpcrt4_conn_np_wait_for_incoming_data() using asynchronous read with zero sized buffer.

The problem with NtFsControlFile(FSCTL_PIPE_PEEK) is that it happily returns
STATUS_SUCCESS with 0 bytes of data available. That makes the client think
that the server already sent a reply and try to read the reply data, which
hangs. A solution to this is call NtReadFile() with zero sized buffer, which
has correct behaviour: just waits for incoming data to appear without mangling
the data in the pipe.
Signed-off-by: Dmitry Timoshkov <dmitry@baikal.ru>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>