Merge pull request 'Added user-agent to webfinger query' (#34) from poesty/snac2:master into master

Reviewed-on: https://codeberg.org/grunfink/snac2/pulls/34

This is to avoid that when sending webfinger queries to some instances (e.g. GoToSocial), we cannot fetch their resources because of the 418 status code returned by the other side.

webfinger.c

@@ -46,7 +46,8 @@ int webfinger_request(const char *qs, char **actor, char **user)
     if (host == NULL || resource == NULL)
         return 400;
 
-    headers = xs_dict_append(headers, "accept", "application/json");
+    headers = xs_dict_append(headers, "accept",     "application/json");
+    headers = xs_dict_append(headers, "user-agent", USER_AGENT);
 
     /* is it a query about one of us? */
     if (strcmp(host, xs_dict_get(srv_config, "host")) == 0) {