[show-hint addon] Move variable into module scope

Author: marijnh

addon/hint/show-hint.js

@@ -1,8 +1,6 @@
 // CodeMirror, copyright (c) by Marijn Haverbeke and others
 // Distributed under an MIT license: https://codemirror.net/LICENSE
 
-var mac = /Mac/.test(navigator.platform);
-
 (function(mod) {
   if (typeof exports == "object" && typeof module == "object") // CommonJS
     mod(require("../../lib/codemirror"));
@@ -170,6 +168,8 @@ var mac = /Mac/.test(navigator.platform);
       Esc: handle.close
     };
 
+    var mac = /Mac/.test(navigator.platform);
+
     if (mac) {
       baseMap["Ctrl-P"] = function() {handle.moveFocus(-1);};
       baseMap["Ctrl-N"] = function() {handle.moveFocus(1);};