Added static helper method to Library interface for getting the wrapped NativeLibrary instance.

Author: serinana47

src/com/sun/jna/Library.java

@@ -271,4 +271,8 @@ public Object invoke(Object proxy, Method method, Object[] inArgs)
             }
         }
     }
+
+    static NativeLibrary getNativeLibrary(final Library library) {
+        return ((Handler)Proxy.getInvocationHandler(library)).getNativeLibrary();
+    }
 }