RFR: 8354189: Remove JLI_ReportErrorMessageSys on Windows [v2]

[Matthias Baesken]

> 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

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24563/files
  - new: https://git.openjdk.org/jdk/pull/24563/files/1e46a30e..42ad8727

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24563&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24563&range=00-01

  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/24563.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24563/head:pull/24563

PR: https://git.openjdk.org/jdk/pull/24563