[jdk17u-dev] RFR: 8285730: unify _WIN32_WINNT settings

[Matthias Baesken]

8285730: unify _WIN32_WINNT settings

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Commit messages:
 - Backport 4fd79a6ad2683e4863bd4e311cb01cbc30ebf57f

Changes: https://git.openjdk.org/jdk17u-dev/pull/628/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=628&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285730
  Stats: 33 lines in 7 files changed: 2 ins; 25 del; 6 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/628.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/628/head:pull/628

PR: https://git.openjdk.org/jdk17u-dev/pull/628