curs_window(3) on FreeBSD

The text 8cb9abc991c1, as FreeBSD 2.1.7.1-RELEASE, FreeBSD 2.1.7-RELEASE, FreeBSD 2.1.5-RELEASE, FreeBSD 2.0.5-RELEASE shipped it.

create ncurses windows

curs_window(3) on FreeBSD now