RFR: 8282386: JavaFX media stubs rely on libav.org [v2]

[Kevin Rushforth]

On Thu, 5 Jan 2023 20:24:41 GMT, Johan Vos <jvos at openjdk.org> wrote:

>> Retrieve libav sources from github.
>> Fix JDK-8282386
>
> Johan Vos has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Use new naming convention when working with libav files downloaded via github

A local build and a CI build both pass now. This looks good.

@sashamatveev Do you also want to take a look at this?

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Marked as reviewed by kcr (Lead).

PR: https://git.openjdk.org/jfx/pull/989