Use enum for class constant

src/hb-cff-interp-common.hh

@@ -477,7 +477,7 @@ struct stack_t
   unsigned int get_count () const { return count; }
   bool is_empty () const { return count == 0; }
 
-  static const unsigned int kSizeLimit = LIMIT;
+  enum { kSizeLimit = LIMIT };
 
   protected:
   bool error;