update swig on windows

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

@@ -0,0 +1,28 @@
+%module csharp_features
+%include "wchar.i"
+
+// SWIG gets the method modifiers wrong occasionally, like with private inheritance, %csmethodmodifiers can fix this
+%csmethodmodifiers Derived::VirtualMethod() "public virtual"
+%csmethodmodifiers MoreDerived::variable "public new"
+
+%inline %{
+class Base {
+public:
+  virtual ~Base() {}
+  virtual void VirtualMethod() {}
+};
+class Derived : private Base {
+public:
+  virtual ~Derived() {}
+  virtual void VirtualMethod() {}
+  int variable;
+};
+class MoreDerived : public Derived {
+public:
+  int variable;
+  // test wide char literals support for C# module
+  void methodWithDefault1(const wchar_t* s = L"literal with escapes \x1234"){}
+  void methodWithDefault2(wchar_t c = L'\x1234'){}
+};
+%}
+