Removed "use strict" from client code

As per http://bugs.jquery.com/ticket/13335

Author: gseguin

js/jquery.mobile.buttonMarkup.js

@@ -11,7 +11,6 @@ define( [ "jquery", "./jquery.mobile.core" ], function( jQuery ) {
 // buttonMarkup is deprecated as of 1.4.0 and will be removed in 1.5.0.
 
 (function( $, undefined ) {
-"use strict";
 
 // General policy: Do not access data-* attributes except during enhancement.
 // In all other cases we determine the state of the button exclusively from its

js/jquery.mobile.media.js

@@ -10,8 +10,6 @@ define( [ "jquery", "./jquery.mobile.core" ], function( jQuery ) {
 	/*! matchMedia() polyfill - Test a CSS media type/query in JS. Authors & copyright (c) 2012: Scott Jehl, Paul Irish, Nicholas Zakas. Dual MIT/BSD license */
 	window.matchMedia = window.matchMedia || (function( doc, undefined ) {
 
-		"use strict";
-
 		var bool,
 			docElem = doc.documentElement,
 			refNode = docElem.firstElementChild || docElem.firstChild,