fixes errors like:

	siod_est.cc:55: error: 'obj' is not a template type

diff -dur speech_tools/include/EST_Chunk.h src.festival.1134794422.18915.715897024/speech_tools/include/EST_Chunk.h
--- speech_tools/include/EST_Chunk.h	2004-04-30 18:56:49.000000000 +0200
+++ speech_tools/include/EST_Chunk.h	2005-12-18 20:21:19.000000000 +0100
@@ -103,6 +103,8 @@
  /*                                                                      */
  /************************************************************************/
 
+class EST_ChunkPtr;
+
 class EST_Chunk  {
   public:
     typedef  unsigned short use_counter;
diff -dur speech_tools/include/siod_defs.h src.festival.1134794422.18915.715897024/speech_tools/include/siod_defs.h
--- speech_tools/include/siod_defs.h	2004-05-29 20:34:40.000000000 +0200
+++ speech_tools/include/siod_defs.h	2005-12-18 21:15:36.000000000 +0100
@@ -87,7 +87,7 @@
 #define USERVAL(x) ((*x).storage_as.user.p)
 #define UNTYPEDVAL(x) ((*x).storage_as.user.p)
 
-#define NIL ((struct obj *) 0)
+#define NIL ((LISP) 0)
 #define EQ(x,y) ((x) == (y))
 #define NEQ(x,y) ((x) != (y))
 #define NULLP(x) EQ(x,NIL)