bug#43065: Fix or remove broken flyspell-issue-welcome-flag option

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

> Btw, can we make this only display the welcome message if
> flyspell-mode is invoked interactively?  Your patch makes this
> unconditional, which I don't think was the original intent.

(I received your email less than a minute after pushing.)

Your observation is correct, I think.

Is this one of those places where we are forced to use
(called-interactively-p 'interactive)?  Or can we add an optional
argument to `define-minor-mode' somehow?