file-updater: Only use SSL ALPN opt if curl version up to date

deps/file-updater/file-updater/file-updater.c

@@ -124,8 +124,10 @@ static bool do_http_request(struct update_info *info, const char *url,
 		curl_easy_setopt(info->curl, CURLOPT_HEADERDATA, info);
 	}
 
+#if LIBCURL_VERSION_NUM >= 0x072400
 	// A lot of servers don't yet support ALPN
 	curl_easy_setopt(info->curl, CURLOPT_SSL_ENABLE_ALPN, 0);
+#endif
 
 	code = curl_easy_perform(info->curl);
 	if (code != CURLE_OK) {