fix extendDeep copying methods from prototype

in removing deprecated __lookupGetter__ and then fixing when it was
undefined the simple copy case was lost.  This delta restores that case.

lib/config.js

@@ -1416,11 +1416,10 @@ util.extendDeep = function(mergeInto) {
       }
 
       // Copy property descriptor otherwise, preserving accessors
-      else {
-        var descriptor = Object.getOwnPropertyDescriptor(Object(mergeFrom), prop);
-        if (descriptor) {
-          Object.defineProperty(mergeInto, prop, descriptor);
-        }
+      else if (Object.getOwnPropertyDescriptor(Object(mergeFrom), prop)){
+          Object.defineProperty(mergeInto, prop, Object.getOwnPropertyDescriptor(Object(mergeFrom), prop));
+      } else {
+          mergeInto[prop] = mergeFrom[prop];
       }
     }
   });