[Bug libstdc++/87193] symbols in <version> have inconsistent types

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87193

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I'm not in a rush to fix this, because sane code should only be using those
values in preprocessor conditions. They have type long only because the
standard doesn't guarantee that type int can represent 6 decimal digits, not
because anybody should care about the type.