[Bug c/88993] GCC 9 -Wformat-overflow=2 should reflect real libc limits

[rjones at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88993

--- Comment #1 from Richard W.M. Jones <rjones at redhat dot com> ---
Sorry, forgot the version.  It's:

gcc-9.0.0-0.3.fc30.x86_64