[issue13501] Make libedit support more generic; port readline / libedit to FreeBSD

[Enji Cooper]

Change by Enji Cooper <yaneurabeya at gmail.com>:


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versions: +Python 2.7, Python 3.4, Python 3.5, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue13501>
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