[Bug libstdc++/83279] std::experimental::filesystem::copy_file can't copy larger files than 2.0GiB

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83279

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
OK I'll try to reproduce it as soon as I can.