[issue20374] Failure to compile with readline-6.3-rc1

[Ned Deily]

Changes by Ned Deily <nad at acm.org>:


Added file: http://bugs.python.org/file33937/issue20374_no_cast_3x.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20374>
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