Patches for openssh port forwarding

[Markus Friedl]

this is not 'clean' since channels.c is linked to both ssh and sshd.

> diff -u -r openssh-2.1.1p4/channels.c openssh-2.1.1p4-jhchanges/channels.c
> --- openssh-2.1.1p4/channels.c	Mon Jun 26 03:22:53 2000
> +++ openssh-2.1.1p4-jhchanges/channels.c	Sun Aug 13 02:22:42 2000
> @@ -59,6 +59,9 @@
>   */
>  static int channels_alloc = 0;
>  
> +/* Jarno: Needed to check if port_forwarding is allowed */
> +extern ServerOptions options;
> +
>  /*
>   * Maximum file descriptor value used in any of the channels.  This is
>   * updated in channel_allocate.