glu dev in mesa attribute

After making multiple outputs in the mesa_glu package the headers are
not included in the mesa attribute.  The attached patch puts them in it.

From ced24208a300bea8234e7898ae6fec34fbd67289 Mon Sep 17 00:00:00 2001
From: Karn Kallio <kkallio@skami.org>
Date: Thu, 1 Sep 2016 16:18:23 -0400
Subject: [PATCH] mesa: Add the mesa glu headers to the mesa attribute.