res_init(3) on FreeBSD

The text d2516b6d5e79, as FreeBSD 2.2.9-RELEASE, FreeBSD 2.2.8-RELEASE, FreeBSD 2.2.7-RELEASE, FreeBSD 2.2.6-RELEASE, FreeBSD 2.2.5-RELEASE shipped it.

resolver routines

res_init(3) on FreeBSD now