[issue28190] Detect curses headers correctly for cross-compiling

[Masayuki Yamamoto]

Masayuki Yamamoto added the comment:

test_curses has been skipped almost. the skip reason has been written  "cygwin's curses mostly just hangs" in test case class.
I removed the skip condition, and ran test. Tests was almost passed. The only, unget_wch was failed by edge case '\U0010FFFF', because the wchar_t size on windows platfrom is two bytes. I'll upload test log together.

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Added file: http://bugs.python.org/file44961/cygwin-test_curses.log

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<http://bugs.python.org/issue28190>
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