[Bug libstdc++/127476] unconditionally includes in freestanding mode

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127476

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> We should install that header.

That's non-trivial, see
https://gcc.gnu.org/pipermail/gcc-patches/2026-October/735420.html