Update utils to new library syntax.

utils/pub/yaml/deep_equals.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#library("deep_equals");
+library deep_equals;
 
 /**
  * Returns whether two objects are structurally equivalent. This considers NaN
  * values to be equivalent. It also handles self-referential structures.
  */
 bool deepEquals(obj1, obj2, [List parents1, List parents2]) {
   if (obj1 === obj2) return true;
   if (parents1 == null) {
     parents1 = [];
     parents2 = [];
@@ skipping 51 matching lines @@
 }
 
 /**
  * Returns whether two doubles are equivalent. This differs from `d1 == d2` in
  * that it considers NaN to be equal to itself.
  */
 bool _doubleEquals(double d1, double d2) {
   if (d1.isNaN && d2.isNaN) return true;
   return d1 == d2;
 }