Add telnet to Linkstation firmware

This tarball contains the Linkstation telnet binary and a script that inserts the binary into a Linkstation 1.4x firmware installer and configures inetd to run telnetd at system startup. Read the instructions at the top of the shell script. I haven't actually tested to see if this works, but if it doesn't it shouldn't take much more effort to fix it.

This approach saves bandwidth compared to downloading a new 37 megabyte installer for each tiny change.