RFR: 8240832: Remove unused applecoreaudio.md third-party legal file

Tue Mar 10 18:41:14 UTC 2020

On Tue, 10 Mar 2020 18:37:50 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> As noted in the JBS issue, this is a follow-on bug to
> [https://bugs.openjdk.java.net/browse/JDK-8232589](https://bugs.openjdk.java.net/browse/JDK-8232589) to remove the
> applecoreaudio.md third-party legal file now that we no longer include or use CoreAudio.

@sashamatveev can you review this?

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PR: https://git.openjdk.java.net/jfx/pull/142