Update core cake.php to match other versions.

This makes the pear package install play nice as well.

lib/Cake/Console/cake.php

@@ -19,6 +19,25 @@
  * @since         CakePHP(tm) v 1.2.0.5012
  * @license       MIT License (http://www.opensource.org/licenses/mit-license.php)
  */
-require_once(dirname(__FILE__) . DIRECTORY_SEPARATOR . 'ShellDispatcher.php');
+$ds = DIRECTORY_SEPARATOR;
+$dispatcher = 'Cake' . $ds . 'Console' . $ds . 'ShellDispatcher.php';
+$found = false;
+$paths = explode(PATH_SEPARATOR, ini_get('include_path'));
+
+foreach ($paths as $path) {
+	if (file_exists($path . $ds . $dispatcher)) {
+		$found = $path;
+	}
+}
+
+if (!$found && function_exists('ini_set')) {
+	$root = dirname(dirname(dirname(__FILE__)));
+	ini_set('include_path', __CAKE_PATH__ . PATH_SEPARATOR . ini_get('include_path'));
+}
+
+if (!include($dispatcher)) {
+	trigger_error('Could not locate CakePHP core files.', E_USER_ERROR);
+}
+unset($paths, $path, $found, $dispatcher, $root, $ds);
 
 return ShellDispatcher::run($argv);