Remove broken Ackerman.inf.java test

This test is actually wrong
* It can terminate (thous is not an infinte loop)
* It will crash with properly optimized code due to a huge call stack

This test assumes that the generated code is too slow to run into stack size problems before it runs into timeout problems

exec/Ackermann.inf.java

-class Ackermann
-{
-
-    public int ack(int m, int n)
-    {
-        if (m == 0)
-        {
-            return n + 1;
-        }
-        else if((m > 0) && (n == 0))
-        {
-            return ack(m - 1, 1);
-        }
-        else if((m > 0) && (n > 0))
-        {
-            return ack(m - 1, ack(m, n - 1));
-        }else {
-            System.out.println(m);
-            return n + 1;
-        }
-    }
-
-    public static void main(String[] args)
-    {
-        Ackermann a = new Ackermann();
-        System.out.println(a.ack(2,1));
-        System.out.println(a.ack(2,2));
-        System.out.println(a.ack(3,3));
-        System.out.println(a.ack(3,8));
-        System.out.println(a.ack(4,4));
-    }
-}