RFR: 8250968: Symlinks attributes not preserved when using jarsigner on zip files

[Sean Coffey]

Continuation of RFR thread from http://mail.openjdk.java.net/pipermail/security-dev/2020-August/022373.html

CSR has been approved.

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Commit messages:
 - JDK-8250968

Changes: https://git.openjdk.java.net/jdk/pull/56/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=56&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8250968
  Stats: 198 lines in 10 files changed: 162 ins; 1 del; 35 mod
  Patch: https://git.openjdk.java.net/jdk/pull/56.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/56/head:pull/56

PR: https://git.openjdk.java.net/jdk/pull/56