RFR: 8378631: Update Zlib Data Compression Library to Version 1.3.2

[Jaikiran Pai]

Can I please get a review of this change which upgrades JDK's in-tree zlib code from 1.3.1 to the recently released zlib 1.3.2 version?

As noted in https://bugs.openjdk.org/browse/JDK-8378631, then changes between the upstream zlib 1.3.1 and 1.3.2 are available here https://github.com/madler/zlib/compare/v1.3.1...v1.3.2.

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Commit messages:
 - zlib bundled, set HAVE_UNISTD_H and HAVE_STDARG_H to 1
 - 8378631: Update Zlib Data Compression Library to Version 1.3.2

Changes: https://git.openjdk.org/jdk/pull/29916/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29916&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378631
  Stats: 1810 lines in 26 files changed: 795 ins; 368 del; 647 mod
  Patch: https://git.openjdk.org/jdk/pull/29916.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29916/head:pull/29916

PR: https://git.openjdk.org/jdk/pull/29916