[jdk21u] RFR: 8318410: jdk/java/lang/instrument/BootClassPath/BootClassPathTest.sh fails on Japanese Windows

[Kimura Yukihiro]

I would like to backport JDK-8318410 to 21u because the test dose not work as intended.
The fix applies cleanly to 21u. 
I tested BootClassPathTest on Windows(English,Japanese) and Linux(locales used in the test with LANG/LC_ALL/LC_CTYPE).

Could someone please review it?

Thanks,
Kimura Yukihiro

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Commit messages:
 - Backport d051f22284e7ccc288c658588f73da672d9bfacd

Changes: https://git.openjdk.org/jdk21u/pull/416/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=416&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318410
  Stats: 39 lines in 2 files changed: 20 ins; 0 del; 19 mod
  Patch: https://git.openjdk.org/jdk21u/pull/416.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/416/head:pull/416

PR: https://git.openjdk.org/jdk21u/pull/416