RFR: JDK-8031767 Support system or alternative implementations of zlib

[Martin Buchholz]

There's an endless debate about the pros and cons of "dynamic linking".

I think it would be best for the JDK to link to system libraries by
default, if possible.

For a particular JDK image, one can drop a patched libz into a
suitable lib directory to override the system one.
It should also be relatively easy to build a JDK with a static libz.a.
And all the cool kids are building docker images where they control everything.

The zlib/info-zip projects don't exhibit a high level of code health,
but OOTO they seem quite stable these days.