only stop inline feed updates with open_basedir enabled if there are any plugins that require CURL enabled

add plugin->flags() returning array with additional plugin information, currently only CURL requirement (optional)

plugins/af_redditimgur/init.php

@@ -8,6 +8,10 @@ class Af_RedditImgur extends Plugin {
 			"fox");
 	}
 
+	function flags() {
+		return array("needs_curl" => true);
+	}
+
 	function init($host) {
 		$this->host = $host;