VOP_RMDIR(9) on FreeBSD

The text b533c8bcb4f3, as FreeBSD 2.2.8-RELEASE, FreeBSD 2.2.7-RELEASE, FreeBSD 2.2.6-RELEASE, FreeBSD 2.2.5-RELEASE, FreeBSD 2.2.2-RELEASE shipped it.

remove a file or directory

VOP_RMDIR(9) on FreeBSD now