[Bug c++/91407] Wnon-virtual-dtor should't fire for classes with operator delete=delete

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91407

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
But it's not enabled by -Wall7

Maybe QtCreator should be fixed instead.