[jdk11u-dev] RFR: 8305950: Have -XshowSettings option display tzdata version

[Goetz Lindenmaier]

I backport this for parity with 11.0.21-oracle.

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Commit messages:
 - Backport d27e56e6d7ea24eb8de91f42fac851839798b4ee

Changes: https://git.openjdk.org/jdk11u-dev/pull/2025/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2025&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305950
  Stats: 9 lines in 2 files changed: 6 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2025.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2025/head:pull/2025

PR: https://git.openjdk.org/jdk11u-dev/pull/2025