[PATCH] Update vpnc-script-sshd to work with Ubuntu 20.04

[Peder O. Klingenberg]

Hi.

Happy user of openconnect here since the start of the plague.  Thanks!
I needed to put the VPN in its own netns to stop it blocking my
non-work-related ssh sessions, so I tried to use vpn-script-ssh instead
of the default vpn-script.

It didn't work for me on Ubuntu 20.04.  I fixed it, and finally got
around to preparing a patch against current infradead.org master.  In
case it's useful to anyone else, I attach it here.

...Peder...
-- 
I wish a new life awaited _me_ in some off-world colony.

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