Collabora copyright updates

which I forgot to add while working on these files.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
diff --git a/src/compositor.h b/src/compositor.h
index 51562a0..a7b2964 100644
--- a/src/compositor.h
+++ b/src/compositor.h
@@ -1,5 +1,6 @@
 /*
  * Copyright © 2008-2011 Kristian Høgsberg
+ * Copyright © 2012 Collabora, Ltd.
  *
  * Permission to use, copy, modify, distribute, and sell this software and
  * its documentation for any purpose is hereby granted without fee, provided