[Bug libstdc++/94936] pmr::synchronized_pool_resource crashes without -pthread

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94936

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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   Target Milestone|---                         |9.4

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed on master only for now, but backports will come soon.