drop support for afs, nnpfs, and procfs from security(8)
by chance, i noticed that security(8) is careful to avoid scanning
filesystems of the types "afs", "nnpfs", and "procfs". According
to "ls /sbin/mount*", no such file systems are supported, and the
only page "man -ak any=afs any=nnpfs any=procfs" brings up seems
to be sshd_config(5) talking about KerberosGetAFSToken, which seems
tangentially related at best. Even pkg_locate(1) comes up empty-handed
with respect to mount_afs, mount_nnpfs, and mount_procfs.
Does anyone think that explicitely excluding these file system
types might still be useful, or is the following simplification
OK? No functional change intended.