libvlc: update to HEAD and update the VLCKit implementation accordingly

Merged Felix Paul Kühne requested to merge fkuehne/VLCKit:update-libvlc-v4 into master

This updates libvlc to HEAD and also updates the VLCKit implementation accordingly.

This removes the "lib: save configuration after playback/parse" patch by @tguillem that was introduced in 2018 and should no longer be needed.

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