[jdk11u-dev] RFR: 8272180: Upgrading JSZip from v3.6.0 to v3.7.1

[Goetz Lindenmaier]

I want to "backport" 8265524 to jdk11u.
This is a follow up of "8265524 Upgrading JSZip from v3.2.2 to v3.6.0" 
The original issue has no patch attached, it's only Oracle internal.
So normal backporting does not work.

Luckily, the bug nicely describes where to get the sources, so I crafted the change myself.
So please review. Ev. compare to https://github.com/Stuk/jszip/releases v.3.7.1.
I also adapted the license as happened in "JDK-8236700 Upgrading JSZip from v3.1.5 to v3.2.2".
That is the MIT license from th jszip github repo.

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

Commit messages:
 - 8272180: Upgrading JSZip from v3.6.0 to v3.7.1

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/461/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=461&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272180
  Stats: 11357 lines in 3 files changed: 11342 ins; 2 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/461.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/461/head:pull/461

PR: https://git.openjdk.java.net/jdk11u-dev/pull/461