From 9cccbcd7b741eecce454ccd65974ae5ab178f2d3 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 8 Jun 2009 13:53:05 +0000
Subject: [PATCH] From Mathias Froehlich, "Without this change packed depth
 stencil attachments are only supported if the GL_EXT_framebuffer_blit
 extension is available. This is due to the early return from the constructor
 if this is missing. As far as I read the standard extension documents, this
 blit call is not required to have packed depth stencil fbos. The change fixes
 this and allows packed stencil attachments on machines without the
 multisample blit command."

Merged from svn/trunk using:

svn merge -r 10326:10327 http://www.openscenegraph.org/svn/osg/OpenSceneGraph/trunk