update swig on windows

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

@@ -0,0 +1,21 @@
+#include "base.h"
+
+class Foo : public Base {
+ public:
+  Foo() { }
+  ~Foo() { }
+  virtual void A() { 
+    printf("I'm Foo::A\n");
+  }
+  void B() {
+    printf("I'm Foo::B\n");
+  }
+  virtual Base *toBase() {
+    return static_cast<Base *>(this);
+  }
+  static Foo *fromBase(Base *b) {
+    return dynamic_cast<Foo *>(b);
+  }
+};
+
+