Remove deprecated checkStructDictInheritance

Deprecated since the 20150505 Closure Compiler release.
See https://github.com/google/closure-compiler/wiki/Releases#may-5-2015-v20150505

src/ol/observable.js

@@ -17,7 +17,6 @@ goog.require('goog.events.EventType');
  * @constructor
  * @extends {goog.events.EventTarget}
  * @fires change
- * @suppress {checkStructDictInheritance}
  * @struct
  * @api stable
  */

src/ol/renderer/layerrenderer.js

@@ -21,7 +21,6 @@ goog.require('ol.vec.Mat4');
  * @constructor
  * @extends {ol.Observable}
  * @param {ol.layer.Layer} layer Layer.
- * @suppress {checkStructDictInheritance}
  * @struct
  */
 ol.renderer.Layer = function(layer) {

src/ol/renderer/maprenderer.js

@@ -34,7 +34,6 @@ ol.RendererType = {
  * @extends {goog.Disposable}
  * @param {Element} container Container.
  * @param {ol.Map} map Map.
- * @suppress {checkStructDictInheritance}
  * @struct
  */
 ol.renderer.Map = function(container, map) {