Fix assertion for some languages when wrapping a C++11 enum class that is private in a class.

Also don't wrap private enums for a few languages that attempted to do so.

Closes #594.

Source/Modules/clisp.cxx

@@ -242,6 +242,9 @@ int CLISP::typedefHandler(Node *n) {
 }
 
 int CLISP::enumDeclaration(Node *n) {
+  if (getCurrentClass() && (cplus_mode != PUBLIC))
+    return SWIG_NOWRAP;
+
   is_function = 0;
   String *name = Getattr(n, "sym:name");