message: Replace `i32` with `c_int` in `memcmp`
  As per the comments from jD91mZM2 on the merge request.
diff: @@ -82,7 +82,7 @@ pub unsafe extern "C" fn memcmp(s1: *const c_void, s2: *const c_void, n: usize)
  let c = *(a as *const u8).offset(i as isize);
  let d = *(b as *const u8).offset(i as isize);
  if c != d {
  - return c as i32 - d as i32;
  + return c as c_int - d as c_int;
  }
  }
  unreachable!()
  @@ -95,7 +95,7 @@ pub unsafe extern "C" fn memcmp(s1: *const c_void, s2: *const c_void, n: usize)
  let mut b = b as *const u8;
  for _ in 0..rem {
  if *a != *b {
  - return a as i32 - b as i32;
  + return a as c_int - b as c_int;
  }
  a = a.offset(1);
  b = b.offset(1);
  