early work to make python bindings work again with ns-3-time

src/core/model/int64x64-128.h

@@ -1,4 +1,5 @@
-#ifndef INT64X64_128_H
+#include "ns3/core-config.h"
+#if !defined(INT64X64_128_H) && defined (INT64X64_USE_128) && !defined(PYTHON_SCAN)
 #define INT64X64_128_H
 
 #include "ns3/core-config.h"

src/core/model/int64x64-cairo.h

@@ -1,4 +1,5 @@
-#ifndef INT64X64_CAIRO_H
+#include "ns3/core-config.h"
+#if !defined(INT64X64_CAIRO_H) && defined (INT64X64_USE_CAIRO) && !defined(PYTHON_SCAN)
 #define INT64X64_CAIRO_H
 
 #include <stdint.h>

src/core/model/int64x64-double.h

@@ -1,4 +1,5 @@
-#ifndef INT64X64_DOUBLE_H
+#include "ns3/core-config.h"
+#if !defined(INT64X64_DOUBLE_H) && (defined (INT64X64_USE_DOUBLE) || defined(PYTHON_SCAN))
 #define INT64X64_DOUBLE_H
 
 #include <iostream>