orbea 169002ef7f Fix a gcc -Wformat= warning with C89_BUILD.
The posix spec claims "%r" is equivelent to "%I : %M : %S %p".

Source: http://pubs.opengroup.org/onlinepubs/9699919799/functions/strftime.html

menu/menu_driver.c:395:15: warning: ISO C90 does not support the ‘%r’ gnu_strftime format [-Wformat=]
             "%r", localtime(&time_));
               ^
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