[Bug libstdc++/95989] Segmentation fault compiling with static libraries and using jthread::request_stop

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95989

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I have a fix for std::this_thread::get_id() but we also need the same fix in
<stop_token> and I'd rather refactor that first to only need to fix it in one
place.