ttynvt: Ignore ioctls entirely in raw mode

Without this minicom Tx does not reach the server.
There may be better solutions.

src/ttynvt.c

@@ -794,6 +794,12 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
         _ioctl_name(cmd), arg, in_buf,
         (unsigned int)in_bufsz, (unsigned int)out_bufsz);
 
+    if (ttynvt_param.raw)
+    {
+        fuse_reply_ioctl(req, 0, 0, 0);
+        return;
+    }
+
     switch (cmd)
     {
     case TCSETSF: