COPYING: add Copyright from Precision Insight

And also from VA Linux Systems.
The COPYING file contains all Copyright notices from source code.
Refer to xf86dri.h.

Signed-off-by: Gaetan Nadon <memsize@videotron.ca>

COPYING

@@ -1,12 +1,24 @@
-This is a stub file.  This package has not yet had its complete licensing
-information compiled.  Please see the individual source files for details on
-your rights to use and modify this software.
+Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
+Copyright 2000 VA Linux Systems, Inc.
+All Rights Reserved.
 
-Please submit updated COPYING files to the Xorg bugzilla:
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sub license, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
 
-https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
+The above copyright notice and this permission notice (including the
+next paragraph) shall be included in all copies or substantial portions
+of the Software.
 
-All licensing questions regarding this software should be directed at the
-Xorg mailing list:
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-http://lists.freedesktop.org/mailman/listinfo/xorg