Add non debug version of libarttest

We now pass the libarttest as an argument to the java program. This
enables using libarttestd by default and libarttest when -O is
specified.

Change-Id: I0de1ae01e2bb5f7b9c7fd7487b6cb55051f60657
diff --git a/test/051-thread/src/Main.java b/test/051-thread/src/Main.java
index b81273e..2e26b22 100644
--- a/test/051-thread/src/Main.java
+++ b/test/051-thread/src/Main.java
@@ -20,11 +20,8 @@
  * Test some basic thread stuff.
  */
 public class Main {
-    static {
-        System.loadLibrary("arttest");
-    }
-
     public static void main(String[] args) throws Exception {
+        System.loadLibrary(args[0]);
         System.out.println("thread test starting");
         testThreadCapacity();
         testThreadDaemons();