Fix ui7969 stop unrar-free packaging steering the user to unrar-nonfree

See https://trisquel.info/en/issues/7969

helpers/make-unrar-free

+#!/bin/sh
+#
+#    Copyright (C) 2013-2015 Andrew M. Lindley <andrew@andrewlindley.co.uk>
+#
+#    This program is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation; either version 2 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program; if not, write to the Free Software
+#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+#
+
+VERSION=1
+
+. ./config
+
+# Trisquel Issue #7969 - package unrar suggests non-free software
+sed '/only the non-free "unrar" package can do that/s//see http\:\/\/www.fsf.org\/blogs\/licensing\/free-rarv3-extraction/
+/Conflicts: unrar-nonfree/d' -i debian/control
+
+changelog "Compiled for Trisquel"
+
+compile
+