Fix more errors reported by Clang.

* src/tgbaalgos/reducerun.hh (tgba_run): Predeclare as a struct
since this is what it is.
* src/tgbatest/randtgba.cc (main): Avoid using "i" with two
different type in the same loop.

src/tgbaalgos/reducerun.hh

@@ -1,3 +1,5 @@
+// Copyright (C) 2010 Laboratoire de Recherche et Developpement de
+// l'Epita.
 // Copyright (C) 2004  Laboratoire d'Informatique de Paris 6 (LIP6),
 // département Systèmes Répartis Coopératifs (SRC), Université Pierre
 // et Marie Curie.
@@ -25,7 +27,7 @@
 namespace spot
 {
   class tgba;
-  class tgba_run;
+  struct tgba_run;
 
   /// \brief Reduce an accepting run.
   /// \ingroup tgba_run