[Bug libstdc++/60555] std::system_category().default_error_condition() doesn't map system errno values to std::generic_category()

[s_gccbugzilla at nedprod dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60555

--- Comment #12 from Niall Douglas <s_gccbugzilla at nedprod dot com> ---
Excellent. Thanks guys!