[Bug libstdc++/95749] std::filesystem::file_size returns wrong size for large files on Windows

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95749

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Also fixed on master by g:9939be5758b52ed2fe1a7e56b94ce6d0f4d81580 but I'm not
sure why that didn't get added here.