COPYING: add missing copyright notices

Refer to: Xcomposite.c
Copyright © 2006 Sun Microsystems

Signed-off-by: Gaetan Nadon <memsize@videotron.ca>
Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>

COPYING

@@ -19,3 +19,22 @@ DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 PERFORMANCE OF THIS SOFTWARE.
 
+Copyright © 2006 Sun Microsystems
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation, and that the name of Sun Microsystems not be used in
+advertising or publicity pertaining to distribution of the software without
+specific, written prior permission.  Sun Microsystems makes no
+representations about the suitability of this software for any purpose.  It
+is provided "as is" without express or implied warranty.
+
+SUN MICROSYSTEMS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+EVENT SHALL SUN MICROSYSTEMS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.