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In zlib module, a dozen constants were exported to user land, If user change the constant, maybe lead unexcepted error. Make them readonly and freezon. PR-URL: https://github.com/iojs/io.js/pull/1361 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Johan Bergström <bugs@bergstroem.nu> Reviewed-By: Shigeki Ohtsu <ohtsu@iij.ad.jp>