[issue25720] Fix curses module compilation with ncurses6

[Masayuki Yamamoto]

Masayuki Yamamoto added the comment:

Thank you for confirming, Yen :)
In this case, It seems necessary that resolves headers. I think missing headers issue maybe solve by #28190. I wrote a join test patch for #28190 and #25720.
Would you be able to resolve headers using this?

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Added file: http://bugs.python.org/file45037/join-test-issue28190-issue25720.patch

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