RFR: 8287895: Some langtools tests fail on msys2

Tue Jun 7 10:17:33 UTC 2022

A bunch of langtools tests, which all rely on `test/langtools/tools/javac/Paths/Util.sh`, fails when run on Windows with msys2, since this environment is not properly detected.

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Commit messages:
 - 8287895: Some langtools tests fail on msys2

Changes: https://git.openjdk.java.net/jdk/pull/9056/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=9056&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287895
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9056.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9056/head:pull/9056

PR: https://git.openjdk.java.net/jdk/pull/9056