dccp: build fixes, mdb (vfs sonode missing)

*** 45,54 ****
--- 45,56 ----
  extern int icmp_stacks_walk_step(mdb_walk_state_t *);
  extern int tcp_stacks_walk_init(mdb_walk_state_t *);
  extern int tcp_stacks_walk_step(mdb_walk_state_t *);
  extern int udp_stacks_walk_init(mdb_walk_state_t *);
  extern int udp_stacks_walk_step(mdb_walk_state_t *);
+ extern int dccp_stacks_walk_init(mdb_walk_state_t *);
+ extern int dccp_stacks_walk_step(mdb_walk_state_t *);
  
  extern int sonode(uintptr_t, uint_t, int, const mdb_arg_t *);
  extern int mi(uintptr_t, uint_t, int, const mdb_arg_t *);
  extern int netstat(uintptr_t, uint_t, int, const mdb_arg_t *);
  extern int dladm(uintptr_t, uint_t, int, const mdb_arg_t *);