merge in netbsd changes.
security fixes, curproc becomes symlink, misc other trash.
SCCS-vsn: sys/miscfs/procfs/procfs.h 8.7
SCCS-vsn: sys/miscfs/procfs/README 8.2
SCCS-vsn: sys/miscfs/procfs/procfs_ctl.c 8.4
SCCS-vsn: sys/miscfs/procfs/procfs_mem.c 8.5
SCCS-vsn: sys/miscfs/procfs/procfs_regs.c 8.4
SCCS-vsn: sys/miscfs/procfs/procfs_subr.c 8.5
SCCS-vsn: sys/miscfs/procfs/procfs_vnops.c 8.8
SCCS-vsn: sys/miscfs/procfs/procfs_status.c 8.4
SCCS-vsn: sys/miscfs/procfs/procfs_vfsops.c 8.5
SCCS-vsn: sys/miscfs/procfs/procfs_fpregs.c 8.2