message: Reimplement strpbrk() using strcspn()
diff: @@ -251,15 +251,13 @@ pub unsafe extern "C" fn strncpy(s1: *mut c_char, s2: *const c_char, n: usize) -
  #[no_mangle]
  pub unsafe extern "C" fn strpbrk(s1: *const c_char, s2: *const c_char) -> *mut c_char {
  - let mut i = 0;
  - while *s1.offset(i) != 0 {
  - if !strchr(s2, *s1.offset(i) as i32).is_null() {
  - return s1.offset(i) as *mut c_char;
  - }
  - i += 1;
  - }
  + let p = s1.offset(strcspn(s1, s2) as isize);
  + if *p != 0 {
  + p as *mut c_char
  + } else {
  ptr::null_mut()
  }
  +}
  #[no_mangle]
  pub unsafe extern "C" fn strrchr(s: *const c_char, c: c_int) -> *mut c_char {
  