Sync graphviz_spirit with boost 1.39

src/graph/read_graphviz_spirit.cpp

@@ -20,6 +20,8 @@
 // Authors: Ronald Garcia and Douglas Gregor
 //
 
+#define BOOST_GRAPH_SOURCE
+
 #ifndef BOOST_GRAPH_READ_GRAPHVIZ_ITERATORS
 #  define BOOST_GRAPH_READ_GRAPHVIZ_ITERATORS
 #endif
@@ -27,10 +29,11 @@
 
 namespace boost { namespace detail { namespace graph { 
 
+BOOST_GRAPH_DECL
 bool read_graphviz(std::istream& in, mutate_graph& graph) 
 {
   using namespace boost;
-  using namespace boost::spirit;
+  using namespace boost::spirit::classic;
 
   typedef std::istream_iterator<char> is_t;
   typedef multi_pass<is_t> iterator_t;