Fix old license in header.

wrapper/matlab/tools/FaustCore.m

@@ -23,7 +23,7 @@
 % 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 Affero General Public License for more details.
+% See the BSD 3-clause (BSD 2) License for more details.
 %
 % You should have received a copy of the GNU Affero General Public License
 % along with this program.  If not, see <http://www.gnu.org/licenses/>.