[Bug c++/80518] -Wsuggest-override does not warn about missing override on destructor

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80518

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The guideline might be changing:
https://github.com/isocpp/CppCoreGuidelines/pull/1448
If that pull request is merged we might want to change -Wsuggest-override too,
without needing a separate option.