Add SuppressWarnings to IPAddressUtil

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/util/IPAddressUtil.java

@@ -44,6 +44,7 @@
 import java.net.URL;
 import java.util.Arrays;
 
+@SuppressWarnings("all")
 public class IPAddressUtil {
     private final static int INADDR4SZ = 4;
     private final static int INADDR16SZ = 16;