x11-toolkits/iwidgets: upgrade to 4.1.1 and correct licence

license.terms says:
Permission to use, copy, modify, distribute and license this software and
its documentation for any purpose, and without fee or written agreement
with DSC, is hereby granted, provided that the above copyright notice
appears in all copies and that both the copyright notice and warranty
disclaimer below appear in supporting documentation, and that the names of
DSC Technologies Corporation or DSC Communications Corporation not be used
in advertising or publicity pertaining to the software without specific,
written prior permission.
Therefore it is packageable.

PR: 286265
Approved by: Chris Hutchinson (maintainer)