update swig on windows

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

@@ -0,0 +1,24 @@
+#include "bar.h"
+
+class Spam : public Bar {
+ public:
+  Spam() { }
+  ~Spam() { }
+  virtual void A() { 
+    printf("I'm Spam::A\n");
+  }
+  void B() {
+    printf("I'm Spam::B\n");
+  }
+  virtual Base *toBase() {
+    return static_cast<Base *>(this);
+  }
+  virtual Bar *toBar() {
+    return static_cast<Bar *>(this);
+  }
+  static Spam *fromBase(Base *b) {
+    return dynamic_cast<Spam *>(b);
+  }
+};
+
+