[jdk21u-dev] RFR: 8301875: java.util.TimeZone.getSystemTimeZoneID uses C library default file mode

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle

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Commit messages:
 - Backport 2d6045a26f60fb36f69680e3a83b8303ab2c13e4

Changes: https://git.openjdk.org/jdk21u-dev/pull/2502/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2502&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301875
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2502.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2502/head:pull/2502

PR: https://git.openjdk.org/jdk21u-dev/pull/2502