Remove an unused variable that was there since the first implementation

of the stored procedure cursors (materialized on disk).

include/mysql_com.h

@@ -203,7 +203,7 @@ typedef struct st_net {
   unsigned char reading_or_writing;
   char save_char;
   my_bool no_send_ok;  /* For SPs and other things that do multiple stmts */
-  my_bool no_send_eof; /* For SPs' first version read-only cursors */
+  my_bool unused; /* Please remove with the next incompatible ABI change */
   my_bool compress;
   /*
     Set if OK packet is already sent, and we do not need to send error

sql/protocol.cc

@@ -346,7 +346,7 @@ send_eof(THD *thd)
 {
   NET *net= &thd->net;
   DBUG_ENTER("send_eof");
-  if (net->vio != 0 && !net->no_send_eof)
+  if (net->vio != 0)
   {
     write_eof_packet(thd, net);
     VOID(net_flush(net));