Tweak to apigen configuration so that it does not generate documentation for php internal classes.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4php/trunk@1394948 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/apigen.neon b/apigen.neon
index 297f3aa..e26db94 100644
--- a/apigen.neon
+++ b/apigen.neon
@@ -19,3 +19,4 @@
 title: Apache log4php

 progressbar: no

 googleAnalytics: UA-26177991-1

+php: no