clean up a couple of compiler warnings

src/lib/ares__addrinfo_localhost.c

@@ -188,6 +188,9 @@ fail:
   return status;
 
 #else
+  (void)aftype;
+  (void)port;
+  (void)nodes;
   /* Not supported on any other OS at this time */
   return ARES_ENOTFOUND;
 #endif

src/lib/ares__parse_into_addrinfo.c

@@ -52,9 +52,7 @@ int ares__parse_into_addrinfo(const unsigned char *abuf,
   char *question_hostname = NULL;
   char *hostname, *rr_name = NULL, *rr_data;
   struct ares_addrinfo_cname *cname, *cnames = NULL;
-  struct ares_addrinfo_node *node, *nodes = NULL;
-  struct sockaddr_in *sin;
-  struct sockaddr_in6 *sin6;
+  struct ares_addrinfo_node *nodes = NULL;
 
   /* Give up if abuf doesn't have room for a header. */
   if (alen < HFIXEDSZ)

src/lib/ares_parse_uri_reply.c

@@ -148,7 +148,7 @@ ares_parse_uri_reply (const unsigned char *abuf, int alen,
 	      	  status = ARES_ENOMEM;
 			  break;
 		    }
-          uri_curr->uri = strncpy(uri_curr->uri, vptr, rr_len-4);
+          uri_curr->uri = strncpy(uri_curr->uri, (const char *)vptr, rr_len-4);
           uri_curr->uri[rr_len-4]='\0';
           uri_curr->ttl = rr_ttl;