test: fix parallel/test-repl with new v8

Per the ES6 spec, V8 3.31 no longer throws a SyntaxError for scoped
function declarations.

PR-URL: https://github.com/iojs/io.js/pull/243


Reviewed-By: Domenic Denicola <domenic@domenicdenicola.com>
Reviewed-By: Fedor Indutny <fedor@indutny.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>