[issue22709] restore accepting detached stdin in fileinput binary mode

[Roundup Robot]

Roundup Robot added the comment:

New changeset ded1336bff49 by R David Murray in branch '3.5':
#22709: Use stdin as-is if it does not have a buffer attribute.
https://hg.python.org/cpython/rev/ded1336bff49

New changeset 688d32cdbc0c by R David Murray in branch 'default':
Merge: #22709: Use stdin as-is if it does not have a buffer attribute.
https://hg.python.org/cpython/rev/688d32cdbc0c

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nosy: +python-dev

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<http://bugs.python.org/issue22709>
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