prepare for future GPLv2+ relicensing

All files under GPLv2 will get GPLv2+ changes starting tomorrow.
event_notifier.c and exec-obsolete.h were only ever touched by Red Hat
employees and can be relicensed now.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/exec-obsolete.h b/exec-obsolete.h
index f8af27e..c412be9 100644
--- a/exec-obsolete.h
+++ b/exec-obsolete.h
@@ -6,8 +6,8 @@
  * Authors:
  *  Avi Kivity <avi@redhat.com>
  *
- * This work is licensed under the terms of the GNU GPL, version 2.  See
- * the COPYING file in the top-level directory.
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
  *
  */