[Bug libstdc++/124554] [16 Regression] with newlib, libstdc++ build fails with 'variable or field ‘longjmp’ declared void' since r16-8118-gc362a260ca2032

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124554

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
See also https://gcc.gnu.org/pipermail/gcc-patches/2026-March/710780.html for
FreeBSD.

We could disable the r16-8118-gc362a260ca2032 change for non-glibc targets ...
but that would be rather ironic because glibc doesn't even need the changes.
It's needed for other targets (e.g. darwin definitely needs it).