ripd: fix compiler warnings

* ripd/rip_interface.c
  * rip_request_neighbor(): comment out, unused
  * rip_request_neighbor_all(): idem
  * rip_interface_up(): Cast flags otherwise compiler complains
    about %lld not matching uint64_t on 64 bit x86. Print in hex
    since flags are bit field.
  * rip_interface_add(): idem
  * rip_interface_delete(): idem
* ripd/rip_zebra.c
  * rip_redistribute_set(): comment out, unused
* ripd/ripd.h
  * rip_redistribute_check(): move prototype here so compiler
    can check function against prototype
* ripd/ripd.c
  * rip_update_default_metric(): comment out, unused
diff --git a/ripd/ripd.h b/ripd/ripd.h
index 4d0c04e..45b07b9 100644
--- a/ripd/ripd.h
+++ b/ripd/ripd.h
@@ -395,6 +395,8 @@
 extern int rip_request_send (struct sockaddr_in *, struct interface *, u_char,
                       struct connected *);
 extern int rip_neighbor_lookup (struct sockaddr_in *);
+
+extern int rip_redistribute_check (int);
 extern void rip_redistribute_add (int, int, struct prefix_ipv4 *, unsigned int, 
 			   struct in_addr *, unsigned int, unsigned char);
 extern void rip_redistribute_delete (int, int, struct prefix_ipv4 *, unsigned int);