Log Message:
zlib-ng: updated to 2.2.2

2.2.2

This release fixes a corruption bug with the inflateback implementation, this was
detected by Docker using pigz w/zlib-ng to decompress a 25GB image file and \ 
failing CRC.
Since this is so far the only known way to trigger the bug, it seems to be hard \ 
to hit.

Most of the rest are minor changes to avoid triggering warnings in MSVC or optional
warnings in other compilers, as well as a few minor fixes to the buildsystem and CI.