curs_kernel(3) on FreeBSD

The text 0f2fc8fd469e, as FreeBSD 2.1.7.1-RELEASE, FreeBSD 2.1.7-RELEASE, FreeBSD 2.1.5-RELEASE, FreeBSD 2.0.5-RELEASE shipped it.

low-level ncurses routines

curs_kernel(3) on FreeBSD now