[issue22709] restore accepting detached stdin in fileinput binary mode

[R. David Murray]

R. David Murray added the comment:

I actually agree that this should be applied not only for backward compatibility reasons, but because it is better duck typing.  It unfortunately leaves code still having to potentially deal with "if python version is 3.4.1 or 3.4.2", but there is nothing that can be done about that.

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nosy: +r.david.murray
versions:  -Python 3.6

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