[Bug tree-optimization/84561] -Wstrinop-truncation with -O2 depends on strncpy's size type

[romain.geissler at amadeus dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84561

--- Comment #1 from Romain Geissler <romain.geissler at amadeus dot com> ---
Note: I am testing with gcc snapshot from 24th February + patch from PR 84468
manually applied (at least I think I did).