synctime.c: fixed user-agent setting.

Some websites meanwhile refuse to reply to requests from ancient
browsers like IE6, therefore I've comment out this setting, but
also fixed the string to now fake IE8 if someone enables it.

docs/examples/synctime.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -92,6 +92,9 @@
 #define MAX_STRING              256
 #define MAX_STRING1             MAX_STRING+1
 
+/* Trick Webserver by claiming that you are using Microsoft WinXP SP2, IE8 */
+/* #define UA "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; SV1)" */
+
 typedef struct
 {
   char http_proxy[MAX_STRING1];
@@ -186,9 +189,9 @@ void SyncTime_CURL_Init(CURL *curl, char *proxy_port,
   if (strlen(proxy_user_password) > 0)
     curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, proxy_user_password);
 
-  /* Trick Webserver by claiming that you are using Microsoft WinXP SP2, IE6 */
-  curl_easy_setopt(curl, CURLOPT_USERAGENT,
-                   "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
+#ifdef UA
+  curl_easy_setopt(curl, CURLOPT_USERAGENT, UA);
+#endif
   curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, *SyncTime_CURL_WriteOutput);
   curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, *SyncTime_CURL_WriteHeader);
 }