- Added user defined python dir to Python's sys.path:

Had to add a function call to creator.c, explained in a note there (look
    for pythondir in the file)

source/blender/python/BPY_extern.h

@@ -47,6 +47,7 @@ struct _object;  // forward declaration for PyObject !
 
 void BPY_start_python(void);
 void BPY_end_python(void);
+void BPY_syspath_append_pythondir(void);
 int BPY_Err_getLinenumber(void);
 const char *BPY_Err_getFilename(void);
 /* void BPY_Err_Handle(struct Text *text); */