update swig on windows

winx64/bin/swigwin-4.0.0/Examples/test-suite/go/virtual_derivation_runme.go

@@ -0,0 +1,12 @@
+package main
+
+import . "virtual_derivation"
+
+// very innocent example
+
+func main() {
+	b := NewB(3)
+	if b.Get_a() != b.Get_b() {
+		panic("something is really wrong")
+	}
+}