<i18n dev> RFR: 8287896: PropertiesTest.sh fail on msys2

[Magnus Ihse Bursie]

The test `test/jdk/java/util/Currency/PropertiesTest.sh` fails on msys2, since it does not properly detect this environment.

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Commit messages:
 - 8287896: PropertiesTest.sh fail on msys2

Changes: https://git.openjdk.java.net/jdk/pull/9057/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=9057&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287896
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9057.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9057/head:pull/9057

PR: https://git.openjdk.java.net/jdk/pull/9057