[jdk21u-dev] RFR: 8318580: "javax/swing/MultiMonitor/MultimonVImage.java failing with Error. Can't find library: /open/test/jdk/java/awt/regtesthelpers" after JDK-8316053

[Andrew Lu]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport e4803e0cbf00da89b98c8703769edc403bb5055b

Changes: https://git.openjdk.org/jdk21u-dev/pull/298/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=298&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318580
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/298.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/298/head:pull/298

PR: https://git.openjdk.org/jdk21u-dev/pull/298