RFR: JDK-8307807 Replace use of System.getProperty("os.name") with PlatformUtil calls [v3]

[Marius Hanl]

On Thu, 11 May 2023 17:09:34 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Carl Döbbelin has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   added export of javafx.base to javafx.web and added platform utils call in urlloader
>
> .idea/jarRepositories.xml line 1:
> 
>> 1: <?xml version="1.0" encoding="UTF-8"?>
> 
> This is not relevant to the bug fix. You need to revert the addition of this file.

Note that when this PR https://github.com/openjdk/jfx/pull/1009 is merged, this file is inside the `.gitignore` and mistakes like this can not happen anymore.

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PR Review Comment: https://git.openjdk.org/jfx/pull/1132#discussion_r1191521498