[Bug libstdc++/79193] libstdc++ configure incorrectly decides linking works for cross-compiler

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79193

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This seems reasonable to me, but this area of the configury is not my forte.