[docs] [issue25592] distutils docs: data_files always uses sys.prefix

[Antoine Pitrou]

Change by Antoine Pitrou <pitrou at free.fr>:


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versions: +Python 3.7, Python 3.8 -Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25592>
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