[Bug libstdc++/58931] condition_variable::wait_until overflowed by large time_point

[aaron at aarongraham dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58931

--- Comment #4 from Aaron Graham <aaron at aarongraham dot com> ---
See bug 41861 for discussion of steady_clock wrt condition_variable.