[issue25720] Fix curses module compilation with ncurses6

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

I'll try to test this on NetBSD after fixing curses on NetBSD. It uses a different implementation of curses which don't support is_pad.

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dependencies: +Make curses compiling on NetBSD 7.1 and tests passing
versions: +Python 2.7, Python 3.6 -Python 3.5

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