Android: Suppress unchecked cast in QtAIM::roleNames

Change-Id: I46e8358ad51edb3eaf87fd57851037c4c50586eb
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>
(cherry picked from commit d6ddda8a5b22a5daafcdb76e2b4a0f5349433546)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/android/jar/src/org/qtproject/qt/android/QtAbstractItemModel.java

@@ -196,6 +196,7 @@ public abstract class QtAbstractItemModel
      *
      * @return The role names map.
      */
+    @SuppressWarnings("unchecked")
     public HashMap<Integer, String> roleNames()
     {
         return (HashMap<Integer, String>)jni_roleNames();