boot: XXX hand out fake host-priv port

* NEWS: Update.
* boot/Makefile (MIGSTUBS): Build stubs for the new kernel interfaces.
(MIGSFLAGS): Include mutation file.
(HURDLIBS): Link against libihash.
* boot/boot.c (privileged, want_privileged): New variables.
(pseudo_privileged_host_port): New variable.
(pseudo_pset, pseudo_kernel): Likewise.
(task_notification_port): Likewise.
(dead_task_notification_port): Likewise.
(boot_demuxer): Handle new protocols.
(OPT_PRIVILEGED): New macro.
(options): Add flag '--privileged' to enable the old mode.
(parse_opt): Handle new flag.
(allocate_pseudo_ports): New function.
(main): Handle new flag.  If not running privileged, allocate more
pseudo ports to hand out in place of privileged kernel ports, create a
task namespace, and a task that the Subhurd can frob instead of the
real kernel task.
(do_mach_notify_dead_name): Handle dying tasks.
(S_vm_set_default_memory_manager): New function.
(S_host_reboot): Likewise.
(S_host_processor_set_priv): Likewise.
(S_register_new_task_notification): Likewise.
(task_ihash_cleanup): Likewise.
(task_ihash): New variable.
(task_died): New function.
(S_mach_notify_new_task): Likewise.
(S_processor_set_tasks): Likewise.
* boot/mig-decls.h: New file.
* boot/mig-mutate.h: Likewise.

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