Fix the timeout option not working when connecting to a HTTP url that requires authentication.

In http_open_cnx, the patch restores the AVDictionary if connection needs to be re-tried
because of a authentication/redirect status code.

Previously, if a 401/407/30x status code was encountered, http_open_cnx would restart at the redo label, but any options
used by the underlying protocol would be missing because they were removed by the first attempt.

Signed-off-by: Brandon Lees <brandon@n-hega.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/http.c

@@ -207,6 +207,9 @@ static int http_open_cnx(URLContext *h, AVDictionary **options)
     HTTPContext *s = h->priv_data;
     int location_changed, attempts = 0, redirects = 0;
 redo:
+    if (attempts > 0)
+        av_dict_copy(options, s->chained_options, 0);
+
     cur_auth_type       = s->auth_state.auth_type;
     cur_proxy_auth_type = s->auth_state.auth_type;