fasta: Let "lib/src/fasta/builder" depend on "lib/src/fasta/util"

pkg/front_end/test/subpackage_relationships_test.dart

Index: pkg/front_end/test/subpackage_relationships_test.dart
diff --git a/pkg/front_end/test/subpackage_relationships_test.dart b/pkg/front_end/test/subpackage_relationships_test.dart
index 05f3e5aa36a79f3fe29c1599efd51a81cc395c14..0cc4c268705cabc9d04930f14a8fadeeee28a8cd 100644
--- a/pkg/front_end/test/subpackage_relationships_test.dart
+++ b/pkg/front_end/test/subpackage_relationships_test.dart
@@ -60,6 +60,7 @@ final subpackageRules = {
     'lib/src/fasta/dill',
     'lib/src/fasta/parser',
     'lib/src/fasta/source',
+    'lib/src/fasta/util',
   ]),
   'lib/src/fasta/dill': new SubpackageRules(allowedDependencies: [
     'lib/src/fasta',