zziplib: update to 0.13.72.

This now uses cmake to build.

2021-01-04  gdraheim@github
    * The testbuilds were fixed to make cmake install and automake install the same
    * The cmake install did need patches for man3 installation on Unix
    * The cmake install did need patches for dll installation on Windows
    * The cmake install did need patches for dylib installation on MacOS
    * The cmake install did need patches for pkgconfig generation
    * Bump testbuilds to modern distro versions (ubuntu 20.04 centos 7.9 / 8.3)
    * Takeover docker_mirror.py for air-gap testings (for testbuilds.py)
    * handle UNZZIP-NOTFOUND in cmake and mark Ubuntu 'unzip' to be broken
    * merge patches for zzip_pread feature from Max Kellermann
    * merge patches for some bugs being found and reported via GitHub issues
    * run azure-pipelines with -DZZIP_TESTCVE=OFF to skip CVE *.zip downloads
    * use zziptests.py --downloadonly to get the CVE zip files for local storage
    * The ninja builds for cmake were run regularly as it seems to be widely used.
    * AND ... rename configure.ac to old.configure.ac to break outdated packaging scripts
    * ....... see testbuilds/*-am-*.dockerfile that it still works to rename them back
    * release 0.13.72

(wiz)