[Bug libstdc++/121811] stdckdint.h fails to compile in C++26 mode in GCC 14

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121811

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Andrew, what's the objection to GCC just putting #ifndef __cplusplus in our
header?

Do we have to make things harder for people?