RFE: ssh-askpass program configurable

[Edward Avis]

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I note that ssh-askpass-gnome was moved into the contrib/ directory of
portable OpenSSH and the configure option for it
(--with-gnome-askpass) was removed.

I can understand not wanting a configure option for one particular
askpass program, but it would be useful to have a general replacement,
as in

% ./configure --with-askpass-program=ssh-askpass-gnome

- -- 
Ed Avis <epa98 at doc.ic.ac.uk>
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