[issue25720] Fix curses module compilation with ncurses6

[Chi Hsuan Yen]

Chi Hsuan Yen added the comment:

Thanks masamoto! There's another minor issue about this patch: if there's no curses.h (ncurses built with --without-curses-h), the detection always fails.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25720>
_______________________________________