openconn: cancel alarm after successful connection

openconn() arms a 60-second alarm before DNS resolution and TCP connect,
but never clears it after the connection succeeds. The timer persists
through the entire response-reading loop in query_server(), causing
premature timeout on slow connections or large whois responses.

Call alarm(0) before returning from openconn() so the alarm only covers
connection establishment.

whois.c

@@ -1132,6 +1132,7 @@ int openconn(const char *server, const char *port)
 	err_sys("connect");
 #endif
 
+    alarm(0);
     return fd;
 }