[Bug libstdc++/106772] atomic::wait shouldn't touch waiter pool if used platform wait

[valera.mironow at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106772

--- Comment #19 from Mkkt Bkkt <valera.mironow at gmail dot com> ---
An example with a futex or other syscall would also work, because atomic::wait
is still not widely used.