[issue29718] Fixed compile on cygwin.

[STINNER Victor]

STINNER Victor added the comment:

+/* Define if pthread_key_t is compatible with int. */
+#undef PTHREAD_KEY_T_IS_COMPATIBLE_WITH_INT

Is this change the implementation of the issue #25658?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29718>
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