android: add simple support library to communicate with the host service

android/java/org/anbox/MainApplication.java

@@ -5,6 +5,12 @@ import android.app.Application;
 public class MainApplication extends Application {
     private NavBar mNavBar;
 
+    static {
+        // Load our native support library on startup so we get
+        // access to several things from the Anbox host service.
+        System.loadLibrary("anbox_support");
+    }
+
     public void startServices() {
         mNavBar = new NavBar(this);
     }