RFR: JDK-8307807 Replace use of System.getProperty("os.name") with PlatformUtil calls [v6]

[Carl Döbbelin]

On Fri, 12 May 2023 15:24:27 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> Darwin OS was a precursor of OS X that followed after rhapsody. As its own OS it stopped being supported in 2002. since kevin was discussing to only support MacOS 11 or newer in jfx 21, i think its safe to say we dont support this old pre version.
>
> Wikipedia says it's currently at the level of macOS Ventura
> 
> 22.4.0 | March 27, 2023 | macOS 13.3, iOS 16.4, iPadOS 16.4, watchOS 9.4 and tvOS 16.4
> 
> https://en.wikipedia.org/wiki/Darwin_(operating_system)#Darwin_20_onwards

Darwin as its own OS stopped existing after 2002 (at least german wilipedia sais so)

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PR Review Comment: https://git.openjdk.org/jfx/pull/1132#discussion_r1192518148