RFR: 8283218: Update GStreamer to 1.20.1 [v5]

[Johan Vos]

On Wed, 20 Apr 2022 23:08:00 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

>> - GStreamer updated to 1.20.1 and GLib updated to 2.72.0.
>> - No changes to our code, except in GstAudioSpectrum.cpp g_atomic_pointer_compare_and_exchange() was changed to g_atomic_pointer_set(). For some reason I was not able to get code compiled with g_atomic_pointer_compare_and_exchange() used from C++ code. Also, I do not see a need to use g_atomic_pointer_compare_and_exchange(), since m_pHolder always equals to old_holder.
>> - Tested on all platforms with all supported media streams.
>
> Alexander Matveev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8283218: Update GStreamer to 1.20.1 [v5]

Marked as reviewed by jvos (Reviewer).

I have this working on Ubuntu 18.04, and that gives me enough confidence that with the appropriate toolchain it can be built for 16.04. Exploring glib-lite.so sounds like a good plan.

-------------

PR: https://git.openjdk.java.net/jfx/pull/768