Freestyle: Fix for VC++ warnings about 'hypot' macro redefinitions (Part 2).

(See commit e1771e72fbbf828dbf5bed871b814288389f3611 for more detail of
the problem).

Fixed for #include <Python.h> not properly put in the extern "C" { ... } construct.

Also removed redundant inclusion of the header file in the Freestyle Python API code.

source/blender/freestyle/intern/python/Interface0D/BPy_SVertex.h

@@ -25,9 +25,9 @@
 #ifndef __FREESTYLE_PYTHON_SVERTEX_H__
 #define __FREESTYLE_PYTHON_SVERTEX_H__
 
-#include "../../view_map/Silhouette.h"
 #include "../BPy_Interface0D.h"
 
+#include "../../view_map/Silhouette.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -35,8 +35,6 @@ extern "C" {
 
 ///////////////////////////////////////////////////////////////////////////////////////////
 
-#include <Python.h>
-
 extern PyTypeObject SVertex_Type;
 
 #define BPy_SVertex_Check(v) (PyObject_IsInstance((PyObject *)v, (PyObject *)&SVertex_Type))