punycode exports nothing if global AMD define is present #7224

> global.define = function () {}
[Function]
> global.define.amd = {}
{}
> require('punycode')
{}

> require('url').parse('http://foo.bar/baz')
TypeError: punycode.toASCII is not a function
    at Url.parse (url.js:312:32)
    at Object.urlParse [as parse] (url.js:73:5)
    at repl:1:16
    at REPLServer.defaultEval (repl.js:272:27)
    at bound (domain.js:280:14)
    at REPLServer.runBound [as eval] (domain.js:293:12)
    at REPLServer.<anonymous> (repl.js:441:10)
    at emitOne (events.js:101:20)
    at REPLServer.emit (events.js:188:7)
    at REPLServer.Interface._onLine (readline.js:224:10)