RFR: 8276766: Enable jar and jmod to produce deterministic timestamped content [v24]

[Andrew Leonard]

> Add a new --source-date <TIMESTAMP> (epoch seconds) option to jar and jmod to allow specification of time to use for created/updated jar/jmod entries. This then allows the ability to make the content deterministic.
> 
> Signed-off-by: Andrew Leonard <anleonar at redhat.com>

Andrew Leonard has updated the pull request incrementally with one additional commit since the last revision:

  8276766: Enable jar and jmod to produce deterministic timestamped content
  
  Signed-off-by: Andrew Leonard <anleonar at redhat.com>

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6481/files
  - new: https://git.openjdk.java.net/jdk/pull/6481/files/82e740e4..0a69d014

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6481&range=23
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6481&range=22-23

  Stats: 99 lines in 2 files changed: 32 ins; 64 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6481.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6481/head:pull/6481

PR: https://git.openjdk.java.net/jdk/pull/6481