[Bug c/39438] Can't compile a wrapper around strftime with -Werror=format-nonliteral

[groungccg at amelkin dot msk.ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39438

--- Comment #12 from Alexander Amelkin <groungccg at amelkin dot msk.ru> ---
Also happens with `gcc (Ubuntu 8.1.0-5ubuntu1~16.04) 8.1.0`