Deprecated use of graph_detail::is_same. Removed usage from visitors

header, and tagged the defining file with the #warning.


[SVN r53151]

libs/graph

@@ -1 +1 @@
-Subproject commit 00211e91359126176b99040766645a20a4fd4c7b
+Subproject commit c2b83032f87df3e27a1107c3e367ed4d7ffca82b