Applied a fix, that will skip the serialization test for compilers that do not provide spirit (and serialization in turn)

[SVN r35670]

libs/graph

@@ -1 +1 @@
-Subproject commit 59ba89640e1cea25ad53fa980bc68f2896c1a07f
+Subproject commit 21b9a9f799457b784936205abc0dfda7e6ede404