Replace stub file with real license.

"XFree86 code without an explicit copyright is covered by the
following copyright/license" ....

Discussed on xorg list.

COPYING

@@ -1,12 +1,23 @@
-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 (C) 1994-2003 The XFree86 Project, 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, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is fur-
+nished 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 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, FIT-
+NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CON-
+NECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-http://lists.freedesktop.org/mailman/listinfo/xorg
+Except as contained in this notice, the name of the XFree86 Project shall not
+be used in advertising or otherwise to promote the sale, use or other deal-
+ings in this Software without prior written authorization from the XFree86
+Project.