[Bug target/64368] [5 Regression] Several libstdc++ test failures on non-linux platforms after r218964.

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64368

--- Comment #19 from Jonathan Wakely <redi at gcc dot gnu.org> ---
r220143 should fix a lot of these failures, I'll check the testresults to see
what remains.