Testcase warning fix

Workaround for seemingly bogus warning: ‘<unnamed>[0]’ may be used uninitialized [-Wmaybe-uninitialized]
diff --git a/Examples/test-suite/cpp11_initializer_list.i b/Examples/test-suite/cpp11_initializer_list.i
index c164624..7e86cc0 100644
--- a/Examples/test-suite/cpp11_initializer_list.i
+++ b/Examples/test-suite/cpp11_initializer_list.i
@@ -39,7 +39,7 @@
 public:
   C(std::initializer_list<const char *> init) {
     for (auto& val : init)
-      joined += val;
+      joined = joined + val;
   }
   C() {}
   const char * get_joined_string() {