message: Avoid assuming c_char is i8
diff: @@ -72,7 +72,7 @@ pub struct sigevent;
  #[no_mangle]
  pub unsafe extern "C" fn asctime(timeptr: *const tm) -> *mut c_char {
  - asctime_r(timeptr, &mut ASCTIME as *mut [i8; 26] as *mut i8)
  + asctime_r(timeptr, ASCTIME.as_mut_ptr().cast())
  }
  #[no_mangle]
  