tiny patch for recognising libncurses

[Patrick J. Lawrence]

> The default krb4 installation installs r(sh|login|cp) suid root and
> are compatible with other r* implementations. If you don't like the
> warning message "using standard r..." you can se RSTAR_NO_WARN=yes.
> 
> Just build with --prefix=/usr and install.

No, that's not correct (at least with the MIT Kerberos V distribution.) 
The r-tools are not backward compatible and when they need to do a
non-kerberized rsh, they will call the old executable which I have just
over-written if I set prefix=/usr. :-)

Pat
-- 
Patrick Lawrence
Distributed Computing Analysis and Support
University of California at Davis