updated for version 7.3.964

Problem:    Python: not so easy to access tab pages.
Solution:   Add window.tabpage, make window.number work with non-current tab
            pages. (ZyX)

src/if_python3.c

@@ -611,9 +611,6 @@ get_py3_exceptions()
 }
 #endif /* DYNAMIC_PYTHON3 */
 
-static PyObject *BufferNew (buf_T *);
-static PyObject *WindowNew(win_T *);
-static PyObject *LineToString(const char *);
 static PyObject *BufferDir(PyObject *, PyObject *);
 
 static int py3initialised = 0;