[Bug libstdc++/91947] std::filesystem::file_size will return wrong value on 32bit platforms with large files support

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91947

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> Huh, I thought I'd already fixed this a while ago.

I was thinking of Bug 85632 which is different.