[Bug bootstrap/100431] Fixes to enable compiling with -Werror=format-security

[joey.dumont at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100431

--- Comment #5 from Joey Dumont <joey.dumont at gmail dot com> ---
I just started looking at these other cases (for some reason I didn't see them
in my initial compilation), but I am not sure what format specifiers should be
used. Are the format specifiers used by __gcc_tdiag__ documented somewhere? I
tried grepping through the source, but couldn't find anything.