update swig on windows

winx64/bin/swigwin-4.0.0/Examples/test-suite/unicode_strings.i

@@ -0,0 +1,25 @@
+%module unicode_strings
+
+%include <std_string.i>
+
+%begin %{
+#define SWIG_PYTHON_2_UNICODE
+%}
+
+%inline %{
+
+const char* non_utf8_c_str(void) {
+        return "h\xe9llo w\xc3\xb6rld";
+}
+
+std::string non_utf8_std_string(void) {
+        return std::string("h\xe9llo w\xc3\xb6rld");
+}
+
+char *charstring(char *s) {
+  return s;
+}
+
+void instring(const char *s) {
+}
+%}