[Bug libstdc++/125956] Build Failures When Building GCC16 on apple-darwin-powerpc 10.4.11

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125956

--- Comment #18 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Your build failures should be fixed with
g:83f0ad40a472d98bf1ed38b7d1c4865fdcb5e068

The fix to the exit status of relpath.sh isn't committed yet, but it won't
matter if you use the current trunk because the incompatibility with GNU Make
3.80 has been fixed, so relpath.sh won't fail now.

The src/c++20/format.cc fix is needed on the gcc-15 and gcc-16 branches too.