Work around a bug in Rhino

Rhino does not like it when the Array constructor is called with this set
to null.  We therefore use .slice() instead to create a copy of the array.

luaparse.js

@@ -1465,7 +1465,7 @@
 
  // Create a new scope inheriting all declarations from the previous scope.
  function createScope() {
- var scope = Array.apply(null, scopes[scopeDepth++]);
+ var scope = scopes[scopeDepth++].slice();
  scopes.push(scope);
  if (options.onCreateScope) options.onCreateScope();
  }