[jdk11u-dev] RFR: 8233559: [TESTBUG] TestNimbusOverride.java is failing on macos

[Christoph Langer]

Backport of 8233559: [TESTBUG] TestNimbusOverride.java is failing on macos

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Commit messages:
 - Backport c6386188143df45bb0a2e72812075cad22c650e4

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/524/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=524&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233559
  Stats: 32 lines in 2 files changed: 6 ins; 4 del; 22 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/524.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/524/head:pull/524

PR: https://git.openjdk.java.net/jdk11u-dev/pull/524