Fix search.js "Uncaught ReferenceError: Cookie is not defined"

Author: eXpl0it3r

doc/header.html.in

@@ -7,6 +7,7 @@
         <link rel="stylesheet" type="text/css" href="doxygen.css" title="default" media="screen,print" />
         <script type="text/javascript" src="jquery.js"></script>
         <script type="text/javascript" src="dynsections.js"></script>
+        <script type="text/javascript" src="cookie.js"></script>
         <link rel="stylesheet" type="text/css" href="search/search.css" />
         <link rel="stylesheet" type="text/css" href="searchOverrides.css" />
         <script type="text/javascript" src="search/searchdata.js"></script>