Suppress a couple of msvc class/struct warnings

[SVN r35567]

include/boost/python/docstring_options.hpp

@@ -62,7 +62,7 @@ class BOOST_PYTHON_DECL docstring_options : boost::noncopyable
         show_signatures_ = true;
       }
 
-      friend class objects::function;
+      friend struct objects::function;
 
   private:
       static volatile bool show_user_defined_;

include/boost/python/numeric.hpp

@@ -17,7 +17,7 @@
 
 namespace boost { namespace python { namespace numeric {
 
-struct array;
+class array;
 
 namespace aux
 {