Add missing #include.

* src/tgbaalgos/cutscc.cc, src/tgbaalgos/ltl2taa.cc:  Include
<algorithm> for set_difference and binary_search.

src/tgbaalgos/cutscc.cc

@@ -20,6 +20,7 @@
 #include <iostream>
 #include <string>
 #include <queue>
+#include <algorithm>
 #include "tgba/tgbaexplicit.hh"
 #include "cutscc.hh"
 

src/tgbaalgos/ltl2taa.cc

-// Copyright (C) 2009, 2010, 2012 Laboratoire de Recherche et
+// -*- coding: utf-8 -*-
+// Copyright (C) 2009, 2010, 2012, 2013 Laboratoire de Recherche et
 // Développement de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
@@ -17,6 +18,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <utility>
+#include <algorithm>
 #include "ltlast/visitor.hh"
 #include "ltlast/allnodes.hh"
 #include "ltlvisit/lunabbrev.hh"