[issue15037] curses.unget_wch and test_curses fail when linked with ncurses 5.7 and earlier

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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pull_requests: +4186

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue15037>
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