pthread_cond_wait(3) on FreeBSD

The text 30429e0edc9d, as FreeBSD 3.2-RELEASE, FreeBSD 3.1-RELEASE, FreeBSD 3.0-RELEASE, FreeBSD 2.2.9-RELEASE, FreeBSD 2.2.8-RELEASE shipped it.

wait on a condition variable

pthread_cond_wait(3) on FreeBSD now