[issue81] possible readline license violation

[Matthew Dillon]

: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.

    Just flip HAVE_READLINE for now.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>