commit 2e377f17 changed the ordering
of the release events as side effect.  Some guests are not happy with
that and don't recognise ctrl-alt-del any more.  This patch restores
the old last-pressed first-released behavior.

Cc: Amos Kong <akong@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>