[jdk21u-dev] RFR: 8320706: RuntimePackageTest.testUsrInstallDir test fails on Linux

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle.

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Commit messages:
 - Backport 726f854b141dc2f6474e81c7bcf12608bf6577ae

Changes: https://git.openjdk.org/jdk21u-dev/pull/1312/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1312&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320706
  Stats: 11 lines in 1 file changed: 7 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1312.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1312/head:pull/1312

PR: https://git.openjdk.org/jdk21u-dev/pull/1312