Function strxfrm_l 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn strxfrm_l(
    s1: *mut c_char,
    s2: *const c_char,
    n: size_t,
    _loc: locale_t,
) -> size_t

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/strxfrm_l.html.