[Bug libstdc++/86419] codecvt::in() and out() incorrectly return ok in some cases.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86419

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Dimitrij Mijoski from comment #10)
> Well, whatever, I will pause my work on this.

Thanks again. There are a few code conversion issues in my TODO list, so I'll
get around to properly reviewing everything above next time I get a chance to
work on it.