[Bug libstdc++/84568] libstdc++-v3 configure checks for atomic operations fail on riscv

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84568

--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's a shame the fix happened after the inferior shared_ptr implementation was
frozen into libstdc++ though :-(