[jdk11u-dev] RFR: 8287895: Some langtools tests fail on msys2

[George Adams]

applies cleanly (except for copyright header) -  [JDK-8287895](https://bugs.openjdk.org/browse/JDK-8287895): Some langtools tests fail on msys2

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Commit messages:
 - Backport f7791ad0ea984d49ff26e6f30233d8dcee4305b8

Changes: https://git.openjdk.org/jdk11u-dev/pull/1540/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1540&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287895
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1540.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1540/head:pull/1540

PR: https://git.openjdk.org/jdk11u-dev/pull/1540