Remove more K&R C support.

tests/conflicts.at

@@ -1,6 +1,6 @@
 # Exercising Bison on conflicts.                         -*- Autotest -*-
 
-# Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
 
 # 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
@@ -55,10 +55,7 @@ AT_DATA_GRAMMAR([input.y],
 [[
 %{
 #include <stdio.h>
-
-#if STDC_HEADERS
-# include <stdlib.h>
-#endif
+#include <stdlib.h>
 
 #define YYERROR_VERBOSE 1
 static void