[Bug libstdc++/78483] Error: reference to 'on_exit' is ambiguous

[krzysztof at jusiak dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78483

--- Comment #5 from Kris <krzysztof at jusiak dot net> ---
Fair do's. But then, IMHO, 'on_exit' shouldn't pollute the global namespace
either. Hence, it should be prefixed with '__'?