remove old non-autoconf config.h

clean up some of the readline code in config.h.in

src/include/config.h.in

@@ -72,17 +72,6 @@
  * Code below this point should not require changes
  */
 
-/* this is meant to handle the condition where the system has readline
- * capabilities, but no history.  Unfortunately, it isn't as simple as
- * testing for the existance of -lhistory, since newer -lreadline seems to
- * include the -lhistory library, but newer readline.h doesn't
- */
-#if defined(HAVE_LIBREADLINE)
-# if !defined(HAVE_HISTORY_H) || !defined(HAVE_READLINE_HISTORY_H)
-#   define NO_HISTORY_H
-# endif
-#endif
-
 #if defined(aix)
 #  define CLASS_CONFLICT 
 #  define DISABLE_XOPEN_NLS