Update guestbook frontend php script suggested in issue kubernetes#18640.

(Created new GCR image version with the changes).

Author: amygdala

examples/guestbook/frontend-controller.yaml

@@ -24,7 +24,7 @@ spec:
     spec:
       containers:
       - name: php-redis
-        image: gcr.io/google_samples/gb-frontend:v3
+        image: gcr.io/google_samples/gb-frontend:v4
         resources:
           requests:
             cpu: 100m

examples/guestbook/php-redis/guestbook.php

@@ -1,6 +1,4 @@
-<?
-
-set_include_path('.:/usr/local/lib/php');
+<?php
 
 error_reporting(E_ALL);
 ini_set('display_errors', 1);