RFR: 8354189: Remove JLI_ReportErrorMessageSys on Windows [v2]

[Alan Bateman]

On Fri, 11 Apr 2025 07:11:19 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> JLI_ReportErrorMessageSys is not used any more on Windows, so we can remove it and make it UNIX-only (there a still a few remaining usages).
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Adjust COPYRIGHT years

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24563#pullrequestreview-2759414858