[jdk21u-dev] RFR: 8345213: JVM Prefers /etc/timezone Over /etc/localtime on Debian 12

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - backport c8a521fddac9d42fe93ea9b3ab89e804bc48bf4e

Changes: https://git.openjdk.org/jdk21u-dev/pull/2318/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2318&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345213
  Stats: 30 lines in 1 file changed: 0 ins; 28 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2318.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2318/head:pull/2318

PR: https://git.openjdk.org/jdk21u-dev/pull/2318