[Python-3000] Dealing with timestamp issues for rebuiling AST using Parser/asdl_c.py

["Martin v. Löwis"]

>   File "./Parser/asdl_c.py", line 744
>     print(auto_gen_msg, file=f)

I think asdl_c.py should be formulated in a way
that is compatible with 2.x. It already uses
f.write in many places; the few remaining ones
should be updated.

Regards,
Martin