pyconfig.h must be included before any system header (as per Python docs; essential for Python 2.3 under Tru64 Unix)

[SVN r17799]

test/extract.cpp

@@ -4,7 +4,6 @@
 // "as is" without express or implied warranty, and with no claim as
 // to its suitability for any purpose.
 
-#include "test_class.hpp"
 #include <boost/python/extract.hpp>
 #include <boost/python/list.hpp>
 #include <boost/python/module.hpp>
@@ -15,6 +14,7 @@
 #include <boost/python/implicit.hpp>
 #include <string>
 #include <boost/lexical_cast.hpp>
+#include "test_class.hpp"
 #include <cassert>
 
 using namespace boost::python;