Got rid of a number of compiler warnings with regard to redefinitions

of _POSIX_C_SOURCE and _XOPEN_SOURCE.  There are no functional changes.
Tested with GCC 4.4.1 on Ubuntu 9.10 (karmic).

source/blender/freestyle/intern/python/BPy_BinaryPredicate0D.h

@@ -1,6 +1,8 @@
 #ifndef FREESTYLE_PYTHON_BINARYPREDICATE0D_H
 #define FREESTYLE_PYTHON_BINARYPREDICATE0D_H
 
+#include <Python.h>
+
 #include "../stroke/Predicates0D.h"
 
 #ifdef __cplusplus
@@ -9,8 +11,6 @@ extern "C" {
 
 ///////////////////////////////////////////////////////////////////////////////////////////
 
-#include <Python.h>
-
 extern PyTypeObject BinaryPredicate0D_Type;
 
 #define BPy_BinaryPredicate0D_Check(v)	(  PyObject_IsInstance( (PyObject *) v, (PyObject *) &BinaryPredicate0D_Type)  )