lsm: remove SELINUX undef

I suspect this snuck in when I was build testing code. Anyway, it shouldn't
be here :)
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/lsm.c

@@ -14,8 +14,6 @@
 #include "images/inventory.pb-c.h"
 #include "images/creds.pb-c.h"
 
-#undef CONFIG_HAS_SELINUX
-
 #ifdef CONFIG_HAS_SELINUX
 #include <selinux/selinux.h>
 #endif