ctype-cp932.c:

  After backporting from 5.0 fix.
  There is no an extra argument in 4.1.

strings/ctype-cp932.c

@@ -244,9 +244,7 @@ static int my_strnncoll_cp932(CHARSET_INFO *cs __attribute__((unused)),
 
 static int my_strnncollsp_cp932(CHARSET_INFO *cs __attribute__((unused)),
                                 const uchar *a, uint a_length, 
-                                const uchar *b, uint b_length,
-                                my_bool diff_if_only_endspace_difference
-                                __attribute__((unused)))
+                                const uchar *b, uint b_length)
 {
   const uchar *a_end= a + a_length;
   const uchar *b_end= b + b_length;