[Bug libstdc++/106953] C++23 add new headers for freestanding

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106953

--- Comment #4 from cqwrteur <unlvsur at live dot com> ---
(In reply to Jonathan Wakely from comment #1)
> Yes, work has already started on this.

BTW TR1_STDINT is still not defined for freestanding without libc. cstdint does
not import any types like std::uint_least64_t.