pass-zenity: simple gtk extension

[morus]

> For the script itself, on X11 if ydotoold isn't running xdotool probably
> should be preferred -- it's not because something is installed that it
> is useable.

That's fair. I think some older version of ydotool would work even
without the daemon so I did it like this and never reconsidered. Maybe I
should track it down and do a version check too.

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