The Pack200 format has been deprecated in OpenJDK for some time, and recently the tools for processing pack200 archives were removed. This is the cause of #6354.

We have other places where we build pack200 artifacts, and they will likely fail to build on recent JDK releases. Since we never really made use of these artifacts anyway, I believe it's time to remove all pack200 references from JRuby's build (both jruby-9.2 branch and master branch).