More -Wcast-error fix

src/hb-dsalgs.hh

@@ -236,10 +236,13 @@ hb_ctz (T v)
 template <typename T>
 static inline T* hb_addressof (T& arg)
 {
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-align"
   /* https://en.cppreference.com/w/cpp/memory/addressof */
   return reinterpret_cast<T*>(
 	   &const_cast<char&>(
 	      reinterpret_cast<const volatile char&>(arg)));
+#pragma GCC diagnostic pop
 }
 
 /* ASCII tag/character handling */