[issue81] possible readline license violation

[Matt Emmerton <bugs@xxxxxxxxxxxxxxxxxxxxxxx>]

Matt Emmerton <matt@gsicomp.on.ca> added the comment:

I have confirmed that the patch breaks world when WANT_KERBEROS is set.
It appears that although kadmin/ktutil don't use readline themselves, libsl 
(which they link with) is the real user of readline.

I note that it appears that kadmin and kadmin are the only things to link with 
libsl, and that the libsl sources have #ifdef HAVE_READLINE wrappers around all 
readline-related code.

I see two options:
1) flip the HAVE_READLINE bit so that we don't need to link with readline, but 
also lose readline support (line editing and history) in the process
2) update libsl to use libedit instead of readline.

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