Test for curl_exec as well to catch hosts that disable it but not curl_init. Fixes #8577 for trunk props sivel.

git-svn-id: http://svn.automattic.com/wordpress/trunk@10190 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/http.php

@@ -1062,7 +1062,7 @@ class WP_Http_Curl {
 	 * @return boolean False means this class can not be used, true means it can.
 	 */
 	function test() {
-		if ( function_exists('curl_init') )
+		if ( function_exists('curl_init') && function_exists('curl_exec') )
 			return true;
 
 		return false;