Curl_socket_ready: make timeout a 'long'

It was mostly typecasted to int all over the code so switching to long
instead all over should be a net gain.

lib/http_proxy.c

@@ -244,7 +244,7 @@ CURLcode Curl_proxyCONNECT(struct connectdata *conn,
 
         /* loop every second at least, less if the timeout is near */
         switch (Curl_socket_ready(tunnelsocket, CURL_SOCKET_BAD,
-                            check<1000L?(int)check:1000)) {
+                                  check<1000L?check:1000)) {
         case -1: /* select() error, stop reading */
           error = SELECT_ERROR;
           failf(data, "Proxy CONNECT aborted due to select/poll error");