[Bug libstdc++/123167] to_chars(long double) produces rubbish with -mlong-double-64

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123167

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>I'm working on a fix as part of my rewrite of to_chars based on Tejú Jaguá

There is no reason to fix this. As mentioned the option is an ABI breaking and
you need to compile libstdc++ with the same option too.