update swig on windows

winx64/bin/swigwin-4.0.0/Examples/python/import/base.h

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+class Base {
+ public:
+     Base() { }
+     virtual ~Base() { }
+     virtual void A() {
+         printf("I'm Base::A\n");
+     }
+     void B() {
+       printf("I'm Base::B\n");
+     }
+     virtual Base *toBase() {
+       return static_cast<Base *>(this);
+     }
+};
+ 
+