opengl: Clear up a few header issues, no functional change

* Philippe voiced that he was the original author in the ML,
  adding Philippe to the headers to ensure credit is given.
* Adding Precision Insight copyright back *just incase*
  It's unclear if Precision Insight code was used given
  Philippe's comments in the ML, lets be safe and add it back.
  As we have Brian's permission for these changes I feel
  comfortable with it.

src/kits/opengl/GLDispatcher.cpp

@@ -1,9 +1,11 @@
 /*
+ * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
  * Copyright 2000-2012 Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
  *		Brian Paul <[email protected]>
+ *		Philippe Houdoin <[email protected]>
  */
 
 

src/kits/opengl/GLDispatcher.h

@@ -1,9 +1,11 @@
 /*
+ * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
  * Copyright 2000-2012 Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
  *		Brian Paul <[email protected]>
+ *		Philippe Houdoin <[email protected]>
  */
 #ifndef GLDISPATCHER_H
 #define GLDISPATCHER_H

src/kits/opengl/GLRendererRoster.cpp

@@ -3,6 +3,7 @@
  * Distributed under the terms of the MIT License.
  *
  * Authors:
+ *		Philippe Houdoin <[email protected]>
  */
 
 

src/kits/opengl/GLRendererRoster.h

@@ -1,6 +1,9 @@
 /*
  * Copyright 2006-2012, Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		Philippe Houdoin <[email protected]>
  */
 #ifndef _GLRENDERER_ROSTER_H
 #define _GLRENDERER_ROSTER_H