[issue9560] platform.py: use -b option for file command in _syscmd_file()

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

Guaranteed?  No.  -b is not required by posix/SUS.  I bet it exists everywhere we care about, though.  (cf. http://en.wikipedia.org/wiki/File_(command))

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nosy: +r.david.murray

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