[jdk17u-dev] RFR: 8276766: Enable jar and jmod to produce deterministic timestamped content

[Andrew Leonard]

This backport (along with others in-progress) enables reproducible building of jar's and jmod's with the addition of a new --date <source date> option. Enabling reproducible timestamped jar & jmod content.

jdk CSR: https://bugs.openjdk.java.net/browse/JDK-8277755

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Commit messages:
 - Backport db68a0ce1ce152345320e70acb7e9842d2f1ece4

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/82/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=82&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276766
  Stats: 479 lines in 8 files changed: 458 ins; 0 del; 21 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/82.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/82/head:pull/82

PR: https://git.openjdk.java.net/jdk17u-dev/pull/82