[8u] 8160217: JavaSound should clean up resources better

[Severin Gehwolf]

On Mon, 2020-06-22 at 21:00 -0400, Zhengyu Gu wrote:
> 8u Webrev: http://cr.openjdk.java.net/~zgu/JDK-8160217-8u/webrev.00/

Some files are missing the Copyright update as done in the original
patch. We should add them, even though they might need to be done
manually.

Thanks,
Severin