RFR: 8304912: Use OperatingSystem enum in java.desktop module [v7]

[Phil Race]

On Tue, 11 Apr 2023 16:02:49 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> Update classes in the java.desktop module to use the jdk.internal.util.OperatingSystem enum instead of the `os.name` system property to select OS specific behaviors.
>
> Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removed unused osTypeAction

Marked as reviewed by prr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13213#pullrequestreview-1384168004