[Bug c++/102168] -Wnon-virtual-dtor shouldn't fire for protected dtor in a class with a friend declaration

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102168

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Like I said, this warning should never be used :-)