[jdk11u-dev] RFR: 8277422: tools/jar/JarEntryTime.java fails with modified time mismatch

[Goetz Lindenmaier]

I backport this for parity with 11.0.16-oracle.

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Commit messages:
 - Backport ad1ff27b730773a141d73744e5f5a899bdfbea78

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/908/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=908&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277422
  Stats: 11 lines in 1 file changed: 9 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/908.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/908/head:pull/908

PR: https://git.openjdk.java.net/jdk11u-dev/pull/908