Rename func to funk in tests to avoid Go keyword problems

Examples/test-suite/javascript/null_pointer_runme.js

@@ -1,6 +1,6 @@
 var null_pointer = require("null_pointer");
 
-if (!null_pointer.func(null)) {
+if (!null_pointer.funk(null)) {
   throw new Error("Javascript 'null' should be converted into NULL.");
 }