[dviout] F1 doesn't open help window

[Akira Kakuto]

Hi Tomek,

> Someone reported to me a problem with opening a help window in dviout:
> neither F1 nor selecting help from the menu works.  (I can confirm the
> problem using the most recent dviout from TL repo.)

Here I can open help by F1 or from the menu with the
dviout in the TL repo. I'm using dviout without a
wrapper. That is a difference.

Thanks,
Akira