bug#25825: 25.1; ispell-find-hunspell-dictionaries not working on Windows

[Stefan Kangas]

Stefan Kangas <stefan@marxist.se> writes:

> It seems to be an issue with my environment.  I've been using this for a
> very long time:
>
>     $ locale
>     LANG=

So, I looked into all my locale stuff again, and it turns out that $LANG
was unintentionally left unset here for boring reasons.  (There is no
reason to leave $LANG unset.)

> One idea to improve the situation on our end is to look for "Can't
> open affix or dictionary files for dictionary named 'default'." and
> raise a better error in these cases.

I think it's better to raise the more helpful error.

How does the attached diff look?

bug-25825-2.diff
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