kiji-express: EXP-421. Express script improperly adds hadoop native libs when found

issue: https://jira.kiji.org/browse/EXP-421
review: https://review.kiji.org/r/1718
commit: https://github.com/kijiproject/kiji-express/commit/64f08f24f03cd9c4875b5a1ca67c59b703ec847d