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_ContextFunctions.h

@@ -1,12 +1,12 @@
 #ifndef FREESTYLE_PYTHON_CONTEXTFUNCTIONS_H
 #define FREESTYLE_PYTHON_CONTEXTFUNCTIONS_H
 
+#include <Python.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include <Python.h>
-
 /*---------------------------Python BPy_ContextFunctions visible prototypes-----------*/
 
 int ContextFunctions_Init( PyObject *module );