nathelper(k): add missing mi.h include

modules_k/nathelper/nathelper.c

@@ -210,6 +210,7 @@
 #include "../../pt.h"
 #include "../../timer_proc.h"
 #include "../../lib/kmi/attr.h"
+#include "../../lib/kmi/mi.h"
 #include "../../lib/kcore/km_ut.h"
 #include "../../lib/kcore/parser_helpers.h"
 #include "../../pvar.h"