dont require pdh.dll on NT 4.0

bindings/java/src/org/hyperic/sigar/Sigar.java

@@ -156,15 +156,19 @@ public class Sigar implements SigarProxy {
     }
 
     private static void loadLibrary() throws SigarException {
-        try {
         if (SigarLoader.IS_WIN32 &&
             System.getProperty("os.version").equals("4.0"))
         {
+            try {
+                //NT 4.0 only
                 String lib =
                     loader.findJarPath("pdh.dll") +
                     File.separator + "pdh.dll";
                 loader.systemLoad(lib);
+            } catch (Exception e) {}
         }
+
+        try {
             loader.load();
         } catch (ArchNotSupportedException e) {
             throw new SigarException(e.getMessage());