THRIFT-4975: Add Makefile.am to the PHP tutorial

Client: php

This closes #1900.
diff --git a/tutorial/php/PhpServer.php b/tutorial/php/PhpServer.php
index 749da3a..f4b3b31 100755
--- a/tutorial/php/PhpServer.php
+++ b/tutorial/php/PhpServer.php
@@ -9,7 +9,7 @@
 
 use Thrift\ClassLoader\ThriftClassLoader;
 
-$GEN_DIR = realpath(dirname(__FILE__).'/..').'/gen-php';
+$GEN_DIR = realpath(dirname(__FILE__)).'/gen-php';
 
 $loader = new ThriftClassLoader();
 $loader->registerNamespace('Thrift', __DIR__ . '/../../lib/php/lib');