[Bug other/121484] GCC 15.2.0 fails to build with previously installed GCC 15.1.0

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121484

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
For future reference, you can fix the old build of GCC 15.1.0 to match the
updated glibc by using the mkheaders script installed as part of that old
build. See
https://gcc.gnu.org/onlinedocs/gcc-15.2.0/gcc/Fixed-Headers.html