iOS: device builds don't use platform-specific files for commonjs modules

problem

When referencing commonjs modules in code, iOS device builds do not reference platform specific modules if they are present, instead they reference the non-platform-specific ones. This does not occur on iOS simulator builds, which behave as expected. This makes it impossible to use platform-specific versions of Javascript files on iOS device builds, being a blocker for the linked tickets.

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

1. Create a traditional titanium app, adding the files mentioned above.
2. Run for iOS simulator
3. Confirm that you get the message from the platform-specific mylib.js file: "hello from the iphone CFG.js"
4. Now run for an iOS device
5. 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)"