[Bug c/81117] Improve buffer overflow checking in strncpy

[dimhen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81117

--- Comment #13 from Dmitry G. Dyachenko <dimhen at gmail dot com> ---
Sounds like -Wno-stringop-overflow does not propagate into LTO build.

I'll try make a small testcase