[PATCH 3 of 4] py3: fully detach TextIOWrapper

[Augie Fackler]

> On Oct 10, 2017, at 10:20, Yuya Nishihara <yuya at tcha.org> wrote:
> 
> On Wed, 04 Oct 2017 23:53:56 +0900, Yuya Nishihara wrote:
>> # HG changeset patch
>> # User Yuya Nishihara <yuya at tcha.org>
>> # Date 1506923984 -3600
>> #      Mon Oct 02 06:59:44 2017 +0100
>> # Node ID fecbf1e8aa17474f448e126697fe287e44c92664
>> # Parent  2b071e9303f748de41c02efdea158883d336224a
>> py3: fully detach TextIOWrapper
> 
> Unfortunately, this broke test-py3-commands.t and it seems the Python
> interpreter really hates detaching TextIOWrapper from stdio. So I'm going
> to drop this and the next patch.

Ugh, python3. Thanks.