Changed class library version printing to support both GNU Classpath and OpenJDK.

ikvm/starter.cs

@@ -168,7 +168,16 @@ public class Starter
 					{
 						Console.WriteLine("{0}: {1}", asm.GetName().Name, asm.GetName().Version);
 					}
-					Console.WriteLine("GNU Classpath version: {0}", java.lang.System.getProperty("gnu.classpath.version"));
+					string ver = java.lang.System.getProperty("gnu.classpath.version");
+					if(ver != null)
+					{
+						Console.WriteLine("GNU Classpath version: {0}", ver);
+					}
+					ver = java.lang.System.getProperty("openjdk.version");
+					if(ver != null)
+					{
+						Console.WriteLine("OpenJDK version: {0}", ver);
+					}
 					return 0;
 				}
 				else if(args[i] == "-showversion")