bug#17976: 24.3; url-retrieve-synchronously doesn't fallback to IPv4

[Juliusz Chroboczek]

The following patch works around the issue for me, so it could be
a timing-dependent problem:

--- url-gw.el.orig      2014-07-10 22:26:05.087977204 +0200
+++ url-gw.el   2014-07-10 22:25:32.972959153 +0200
@@ -240,8 +240,7 @@
                           name buffer host service
                           :type gw-method
                           ;; Use non-blocking socket if we can.
-                          :nowait (featurep 'make-network-process
-                                            '(:nowait t))))
+                          :nowait nil))
                         (`socks
                          (socks-open-network-stream name buffer host service))
                         (`telnet