Resource rules issue with iOS 9

Apple has ceased using resource rules[1]. The `build.xcconfig` file still include a line on this, and the file is also included.

Apples build-script still presume they'll be used[2], probably an error on Apples part. Following the guide in ref 2 solves the issue.

This issue prevents building of iOS 9 with Cordova.

This may be deemed outside the scope of Cordova. If that's the case, perhaps a friendly message could be included.

[1] https://developer.apple.com/library/mac/technotes/tn2206/_index.html#//apple_ref/doc/uid/DTS40007919-CH1-TNTAG401
[2] http://www.jayway.com/2015/05/21/fixing-your-ios-build-scripts/