Get a **killCursors** message.

def kill_cursors(cursor_ids):
    """Get a **killCursors** message.
    """
    data = _ZERO_32
    data += struct.pack("<i", len(cursor_ids))
    for cursor_id in cursor_ids:
        data += struct.pack("<q", cursor_id)
    return __pack_message(2007, data)