add def arg case, as mentioned in the manual

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@7067 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Examples/test-suite/python/varargs_runme.py

@@ -9,3 +9,7 @@ if f.str != "Greetings":
 
 if f.test("Hello") != "Hello":
     raise RuntimeError, "Failed"
+
+
+if varargs.test_def("Hello") != "Hello":
+    raise RuntimeError, "Failed"

SWIG/Examples/test-suite/varargs.i

@@ -1,12 +1,17 @@
 // Tests SWIG's *default* handling of varargs.  The default behavior is to simply ignore the varargs.
 %module varargs
 
-%inline %{
+%varargs(int mode = 0) test_def;
 
+%inline %{
 char *test(const char *fmt, ...) {
   return (char *) fmt;
 }
 
+const char *test_def(const char *fmt, ...) {
+  return fmt;
+}
+
 class Foo {
 public:
     char *str;