[jdk21u-dev] RFR: 8316274: javax/swing/ButtonGroup/TestButtonGroupFocusTraversal.java fails in Ubuntu 23.10 with Motif LAF

[Goetz Lindenmaier]

I backport this for parity with 21.0.11-oracle.

Clean backport, but needed to fix syntax.

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Commit messages:
 - fix java syntax
 - backport d62553d8dce7fe21942ec7a1268f536d9725b054

Changes: https://git.openjdk.org/jdk21u-dev/pull/2527/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2527&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316274
  Stats: 57 lines in 1 file changed: 0 ins; 45 del; 12 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2527.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2527/head:pull/2527

PR: https://git.openjdk.org/jdk21u-dev/pull/2527