Update sudo package to 1.6.9p17.

660) The -i flag should imply resetting the environment, as it did in
    sudo version prior to 1.6.9.  Also, the -i and -E flags are
    mutually exclusive.

661) Fixed the configure test for dirfd() under Linux.

662) Fixed test for whether -lintl is required to link.

663) Changed how sudo handles the child process when sending mail.
    This fixes a problem on Linux with the mail_always option.

664) Fixed a problem with line continuation characters inside of
    quoted strings.

(taca)