Unbreak test

src/http.h

@@ -65,3 +65,4 @@ void mg_http_bauth(struct mg_connection *, const char *user, const char *pass);
 struct mg_str mg_http_get_header_var(struct mg_str s, struct mg_str v);
 size_t mg_http_next_multipart(struct mg_str, size_t, struct mg_http_part *);
 int mg_http_status(const struct mg_http_message *hm);
+void mg_hello(const char *url);