<sys/proc.h> to <sys/systm.h>. Correctly document the #includes needed in the manpage. Add one now needed #include of <sys/systm.h>. Remove the consequent 48 unused #includes of <sys/proc.h>.
API changes: - additional IPv6 ioctls - IPsec PF_KEY API was changed, it is mandatory to upgrade setkey(8). (also syntax change)