Fix VaArgs configuration.

examples/foundation/nswrap.toml

@@ -16,3 +16,4 @@ Classes = [
 ]
 SysImports = [ "Foundation/Foundation.h" ]
 Pragma = [ 'clang diagnostic ignored "-Wformat-security"' ]
+VaArgs = 32

main.go

@@ -173,8 +173,9 @@ func Start() (err error) {
 	w.SysImport(Config.SysImports)
 	w.Pragma(Config.Pragma)
 	if Config.VaArgs == 0 {
-		w.VaArgs = 16
+		Config.VaArgs = 16
 	}
+	w.VaArgs = Config.VaArgs
 	for _, u := range tree {
 		for _, n := range(u.Children()) {
 			switch x := n.(type) {