(main):

  Use add_canonical_host() to implement the -h option.
  Only let root specify the login host.
  child_lookup() now takes an additional PATH arg, and calls
    hurd_file_name_path_lookup() instead.
  Pass a path when looking up the shell executable.
  Do all file-name lookups using the target authentication, so that login
    isn't a security hole.
  Rework how password-checking is done somewhat (only ask when necessary).
  Use exec_reauth() instead of our own.
  If setting the real [ug]id, also add it as the `saved id'.
  Use BACKUP_SHELL instead of FAILURE_SHELL define.
  Get rid of various string vars only used once.
(add_canonical_host): New function.
(add_utmp_entry):
  Use VIA_ADDR instead of VIA in the utmp entry if it fits better.
(add_entry): Function moved out of main.
(cat): Take an io_t port instead of a file descriptor.
(options, main):
  Add -k/--keep & -S/--shell-arg options.
  Remove -m/--umask option; use UMASK param instead.
(FAILURE_SHELL): Macro deleted.
(default_args): Add BACKUP_SHELL param.

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