serialize test fails on VC 7.0

[SVN r35283]

status/explicit-failures-markup.xml

@@ -1496,6 +1496,7 @@
             <test name="gursoy_atun_layout_test"/>
             <test name="graphviz_test"/>
             <test name="matching_test"/>
+            <test name="serialize"/>
             <test name="subgraph"/>
             <test name="transitive_closure_test"/>
             <test name="vector_graph_cc"/>