[issue5999] compile error on HP-UX 11.22 ia64 - 'mbstate_t' is used as a type, but has not been defined as a type

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at haypocalc.com>:


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nosy: +haypo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5999>
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