[Bug target/64368] [5 Regression] Several libstdc++ test failures on non-linux platforms after r218964.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64368

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Dominique d'Humieres from comment #15)
> Note that the last failures belong to another PR: they come from a later
> commit and I see several of them on darwin (see FX tests). I have no
> inclination to open a PR for them as long as the PRs I open are rotting for
> ever.

This PR is a month old today, hardly forever. I'm going to fix it.