Possible swig-py windows code cleanup

By applying the following patch, it is compiling:

Index: swigutil_py.c
======================================================
=============
--- swigutil_py.c       (revision 3795)
+++ swigutil_py.c       (working copy)
@@ -705,9 +705,14 @@

   if (PyString_Check (py_file))
     {
+#ifdef WIN32
+      fd = open (PyString_AS_STRING (py_file),
+                 O_CREAT | O_RDWR);
+#else
       fd = open (PyString_AS_STRING (py_file),
                  O_CREAT | O_RDWR,
                  S_IRUSR | S_IWUSR);
+#endif
     }
   else if (PyFile_Check (py_file))
     {

Original issue reported by mahae