[jfx17u] RFR: 8283218: Update GStreamer to 1.20.1

[Kevin Rushforth]

On Mon, 9 May 2022 21:07:39 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> Almost clean backport to `jfx17u`. Tested in connection with libffi update in the `test-kcr-17.0.4` branch.
> 
> The only difference from the mainline patch is that the following file is not present in `jfx17u`, so that part of the patch was skipped:
> 
> 
> modules/javafx.media/src/main/native/gstreamer/gstreamer-lite/gst-plugins-good/gst/audioparsers/gstaacparse.c

Reviewer: @johanvos

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PR: https://git.openjdk.java.net/jfx17u/pull/54