[TIMOB-14884] iOS: device builds don't use platform-specific files for commonjs modules

problem

test case

app.js

var win = Ti.UI.createWindow({
	backgroundColor: '#fff',
	modal: false,
	exitOnClose: true
});

win.open();

require('lib/mylib').sayHello();

lib/mylib.js

exports.sayHello = function() {
	alert('hello from the CFG.js (you should never see this)');
}

iphone/lib/mylib.js

exports.sayHello = function() {
	alert('hello from the iphone CFG.js');
}

reproduce

Create a traditional titanium app, adding the files mentioned above.

Run for iOS simulator

Confirm that you get the message from the platform-specific mylib.js file: "hello from the iphone CFG.js"

Now run for an iOS device

You will get the error described here, where the non-platform-specific module is referenced, giving you the message: "hello from the CFG.js (you should never see this)"