misc: fix stuff up to make SDL example work again

it still behaves weirdly, should probably find some
other example since I don't trust my own code.

src/api-impl/android/app/Activity.java

@@ -390,5 +390,7 @@ public class Activity extends Context implements Window.Callback {
 		finish();
 	}
 
+	public void setIntent(Intent newIntent) {}
+
 	public void unregisterReceiver(BroadcastReceiver receiver) {}
 }