[jdk17u-dev] RFR: 8287724: Fix various issues with msys2

[George Adams]

Clean backport of [JDK-8287724](https://bugs.openjdk.java.net/browse/JDK-8287724): Fix various issues with msys2

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Commit messages:
 - Backport bddef7151849a213926ffdd86a7e228db66606b1

Changes: https://git.openjdk.org/jdk17u-dev/pull/541/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=541&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287724
  Stats: 38 lines in 3 files changed: 23 ins; 7 del; 8 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/541.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/541/head:pull/541

PR: https://git.openjdk.org/jdk17u-dev/pull/541