update swig on windows

winx64/bin/swigwin-4.0.0/Examples/lua/embed/example.c

@@ -0,0 +1,22 @@
+/* File : example.c */
+
+#include <stdio.h>
+
+/* A global variable */
+double Foo = 3.0;
+
+/* Compute the greatest common divisor of positive integers */
+int gcd(int x, int y) {
+  int g;
+  g = y;
+  while (x > 0) {
+    g = x;
+    x = y % x;
+    y = g;
+  }
+  return g;
+}
+
+void greeting() {
+  printf("Hello from the C function 'greeting'\n");
+}