cex: use the glyphs

* src/derivation.c: here.
* src/gram.h, src/gram.c (print_arrow, print_dot, print_fallback):
Remove.

src/gram.h

@@ -103,8 +103,6 @@
 
 # include "system.h"
 
-# include <unicodeio.h>
-
 # include "location.h"
 # include "symtab.h"
 
@@ -217,41 +215,6 @@ typedef struct
 extern rule *rules;
 extern rule_number nrules;
 
-/* Fallback in case we can't print "•" or "→".  */
-static inline long
-print_fallback (unsigned int code _GL_UNUSED,
-                const char *msg _GL_UNUSED,
-                void *callback_arg)
-{
-  FILE *out = (FILE *) callback_arg;
-  switch (code)
-    {
-    case 0x2022:
-      putc ('.', out);
-      break;
-    case 0x2192:
-      fputs ("->", out);
-      break;
-    default:
-      abort ();
-    }
-  return -1;
-}
-
-static inline void
-print_arrow (FILE *out)
-{
-  unicode_to_mb (0x2192, fwrite_success_callback, print_fallback, out);
-}
-
-/* Print "•", the symbol used to represent a point in an item (aka, a
-   dotted rule).  */
-static inline void
-print_dot (FILE *out)
-{
-  unicode_to_mb (0x2022, fwrite_success_callback, print_fallback, out);
-}
-
 /* Get the rule associated to this item.  ITEM points inside RITEM.  */
 static inline rule const *
 item_rule (item_number const *item)