Make classes in ol/ available as named exports from ol

src/ol/Map.js

@@ -1,7 +1,7 @@
 /**
  * @module ol/Map
  */
-import {inherits} from './index.js';
+import {inherits} from './util.js';
 import PluggableMap from './PluggableMap.js';
 import {defaults as defaultControls} from './control/util.js';
 import {defaults as defaultInteractions} from './interaction.js';