Don't rely on include_path to include files.

Always use dirname() or, once available, ABSPATH.

props ketwaroo, hakre.
fixes #17092.

Built from https://develop.svn.wordpress.org/trunk@25616


git-svn-id: http://core.svn.wordpress.org/trunk@25533 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-trackback.php

@@ -9,7 +9,7 @@
  */
 
 if (empty($wp)) {
-	require_once('./wp-load.php');
+	require_once( dirname( __FILE__ ) . '/wp-load.php' );
 	wp( array( 'tb' => '1' ) );
 }