[Bug c/106537] GCC doesn't support -W[no-]compare-distinct-pointer-types

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106537

--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
Would it be possible to add a fix-it hint to this warning, too, while you're at
it?