Don't realpath jars on the classpath.
Don't realpath jars on the classpath.

We use a symlink farm so that paths inside zinc analysis files will be portable.

The realpath-ing caused zinc analysis to contain direct references into the
ivy cache, which is obviously not portable.

Testing Done:
CI baking: https://travis-ci.org/pantsbuild/pants/builds/46501760

TODO: Add a regression test. Putting this out there now to unblock folks.

Reviewed at https://rbcommons.com/s/twitter/r/1588/

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