[jdk17u-dev] RFR: 8287902: UnreadableRB case in MissingResourceCauseTest is not working reliably on Windows

[George Adams]

Hi all,

This pull request contains a backport of [JDK-8287902](https://bugs.openjdk.org/browse/JDK-8287902), commit [975316e3](https://github.com/openjdk/jdk/commit/975316e3e5f1208e4e15eadc2493d25c15554647) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Magnus Ihse Bursie on 10 Jun 2022 and was reviewed by Naoto Sato.

It fixes an issue that shows up in the new GHA workflow.

Thanks!

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Commit messages:
 - Backport 975316e3e5f1208e4e15eadc2493d25c15554647

Changes: https://git.openjdk.org/jdk17u-dev/pull/546/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=546&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287902
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/546.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/546/head:pull/546

PR: https://git.openjdk.org/jdk17u-dev/pull/546