curs_insstr(3) on FreeBSD

The text 85e0dafaa9cf, as FreeBSD 2.1.7.1-RELEASE, FreeBSD 2.1.7-RELEASE, FreeBSD 2.1.5-RELEASE, FreeBSD 2.0.5-RELEASE shipped it.

insert string before cursor a ncurses window

curs_insstr(3) on FreeBSD now