Update sudo to 1.5.7p4.

Changes since 1.5.6:
- Various bug fixes (not security related).
- All compile-time options are now set via options to the configure script.
- visudo is now installed in /usr/local/sbin where it belongs.
  [of course this is ${PREFIX}/sbin in our package for a long time - TF]
- two problems with tgetpass() have been fixed. In one case the user was
  not always given a chance to enter a password. In the other a newline
  was not always printed after the password was entered on Linux.
- Added support for Digital UNIX SIA (Security Integration Architecture).
- %groups now work as RunAs specifiers like the man page says.
- Sudo now sets the USER environment variable to the target user
  (root unless -u is specified).
- Sudo will print "command not found" unless configure was run with
  --disable-path-info. Also, tell user when we ignore '.' in their path and
  it would have been used but for --with-ignore-dot. This means that sudo can
  be used to gather information about the existence of executable in
  directories not accessible by a normal user. If this bothers you, run
  configure with --disable-path-info.
  [in our package --disable-path-info is default - TF]
- A longstanding bug wrt "sudo -l" has been fixed that could cause "sudo -l"
  to complain about non-existent syntax errors.
- When configured with --with-tty-tickets the filename is now "user:tty"
  (was "user.tty") since a username could have a '.' in it.

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