[Bug 2002511] Re: zlib 1.2.13 (and patched 1.2.11) breaks libxml(2) on s390x

[Frank Heimes]

Attaching the slightly modified and renamed patch (original is at LP#1990379),
now as quilt patch, with some whitespace adjustments and a proper dep3 header.

** Patch added: "1390.patch"
   https://bugs.launchpad.net/ubuntu-z-systems/+bug/2002511/+attachment/5640638/+files/1390.patch

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Title:
  zlib 1.2.13 (and patched 1.2.11) breaks libxml(2) on s390x

Status in Ubuntu on IBM z Systems:
  New
Status in zlib package in Ubuntu:
  New

Bug description:
  It has been reported that 1.2.13 as well as the patch from LP#1990379 breaks libxml2 (and libxml) on s390x:
  (https://bugzilla.redhat.com/show_bug.cgi?id=2155328). The attached patch should fix the issue.

  The upstream author proposed a fix and a new test for zlib-ng
  (https://github.com/zlib-ng/zlib-ng/pull/1390) in order to detect such
  breakages in the future.

  ___

  This was initially reported as part of LP#1990379,
  especially: https://bugs.launchpad.net/ubuntu/+source/zlib/+bug/1990379/comments/12
  but needs a separate LP bug (number) - this one.
  ___

  The proposed patch at https://launchpadlibrarian.net/641454325/patch-1.2.11
  needed some tweaks regarding white-spaces, but then applied fine on focal, jammy, kinetic and also  1.2.13, which is what we currently have in lunar-proposed.

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