Don't rely on include_path to include files.

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

props ketwaroo, hakre.
fixes #17092.


git-svn-id: https://develop.svn.wordpress.org/trunk@25616 602fd350-edb4-49c9-b593-d223f7449a82

src/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' ) );
 }