* slint.c: Applied the patch from Bill Nottingham <wen1@cec.wustl.edu>
to make it link against SLang >=1.0.
I reviewed the diffs to the part of SLang we use and there are no
further changes to MC necessary (one function's return value
changed it's meaning but we don't use this return value).
* configure.in: Undone the change which prevented linkage against
SLang >=1.0
