RFR: JDK-8308028 Replace more uses of System.getProperty("os.name") with PlatformUtil calls [v2]

[Carl Döbbelin]

On Sat, 13 May 2023 16:48:12 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> modules/javafx.media/src/main/java/com/sun/media/jfxmediaimpl/HostUtils.java line 60:
>> 
>>> 58: 
>>> 59:     public static boolean isWindows() {
>>> 60:         return osName.startsWith("windows");
>> 
>> `osName` is unused now
>
> `osArch` is also unused. It's just a local variable.

@nlisker osArch seems to be used for is64bit still

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PR Review Comment: https://git.openjdk.org/jfx/pull/1134#discussion_r1193013776