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The "or-irq" device is only used by certain machines. Let's add a proper config switch for it so that it only gets compiled when we really need it. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20190817101931.28386-6-thuth@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>