RFR: 8354189: Remove JLI_ReportErrorMessageSys on Windows

[Alan Bateman]

On Thu, 10 Apr 2025 08:03:58 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).

I think this looks okay, can you update the copyright header dates before you integrate.

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Marked as reviewed by alanb (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24563#pullrequestreview-2757328338