[Bug c++/66290] wrong location for -Wunused-macros

[lhyatt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66290

--- Comment #7 from Lewis Hyatt <lhyatt at gcc dot gnu.org> ---
The wrong location is fixed for GCC 13. Shall I leave the PR open for now,
since there was also the issue of getting a caret pointing to the name of
macro, rather than just a diagnostic for the whole line? I can look into that
too.