RFR: JDK-8308028 Replace more uses of System.getProperty("os.name") with PlatformUtil calls [v4]

[Nir Lisker]

On Sat, 13 May 2023 17:36:59 GMT, Carl Döbbelin <duke at openjdk.org> wrote:

>> replaced implementation of OS checks in HostUtils with calls of PlatformUtil
>
> Carl Döbbelin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   removed HostUtils

Marked as reviewed by nlisker (Reviewer).

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PR Review: https://git.openjdk.org/jfx/pull/1134#pullrequestreview-1425445476