Add missing copyrights

Author: eregon

lib/cext/include/truffleruby/truffleruby-abi-version.h

@@ -1,3 +1,13 @@
+/*
+ * Copyright (c) 2024 Oracle and/or its affiliates. All rights reserved. This
+ * code is released under a tri EPL/GPL/LGPL license. You can use it,
+ * redistribute it and/or modify it under the terms of the:
+ *
+ * Eclipse Public License version 2.0, or
+ * GNU General Public License version 2, or
+ * GNU Lesser General Public License version 2.1.
+ */
+
 #ifndef TRUFFLERUBY_ABI_VERSION_H
 #define TRUFFLERUBY_ABI_VERSION_H