8233623: Add classpath exception to copyright in EventHandlerProxyCreator.java file

Reviewed-by: neugens

src/share/classes/jdk/jfr/internal/EventHandlerProxyCreator.java

@@ -6,7 +6,9 @@
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or