[skip ci] Add filter extension requirement

Author: Girgias

ext/curl/tests/curl_setopt_CURLOPT_PREREQFUNCTION.phpt

@@ -2,6 +2,7 @@
 Curl option CURLOPT_PREREQFUNCTION
 --EXTENSIONS--
 curl
+filter
 --SKIPIF--
 <?php
 $curl_version = curl_version();