. Link with the system libz instead of building the our own internal
copy. This should have the following effects:
. Fix problems experienced by programmes that dynamically create their
own copy of the JVM and are linked against the system's zlib (e.g.,
. Reduce the potential for zlib based security problems
affecting the JDK.
This is similar to the patch in the PR, but was actually backported from
the patches for the jdk15 port, so its a touch different.