[Bug go/114875] runtime/runtime.h should be updated to compile under C23

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114875

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Also it is not just true/false.
It is:
typedef _Bool                   bool;

The rest looks ok too.