harfbuzz: Fix legacy_numeric_constants lints.

These are from nightly clippy. Prefer using associated constants
rather than some of the older functions and constants as they
are likely to be deprecated in the future.

harfbuzz/src/blob.rs

@@ -39,7 +39,7 @@ impl<'a> Blob<'a> {
     /// assert!(!blob.is_empty());
     /// ```
     pub fn new_read_only(data: &'a [u8]) -> Blob<'a> {
-        assert!(data.len() <= c_uint::max_value() as usize);
+        assert!(data.len() <= c_uint::MAX as usize);
         unsafe {
             Blob::from_raw(sys::hb_blob_create(
                 data.as_ptr() as *const c_char,
@@ -70,7 +70,7 @@ impl<'a> Blob<'a> {
     #[cfg(feature = "std")]
     pub fn new_from_arc_vec(data: Arc<Vec<u8>>) -> Blob<'static> {
         let len = data.len();
-        assert!(len <= c_uint::max_value() as usize);
+        assert!(len <= c_uint::MAX as usize);
         unsafe {
             let data_ptr = data.as_ptr();
             let ptr = Arc::into_raw(data);