Fix for smart_cast.h - it can not use pragma once (but a normal include guard works - go figure).

Author: tamlin-mike

src/xrServerEntities/smart_cast.h

@@ -6,6 +6,8 @@
 //	Description : Smart dynamic cast
 ////////////////////////////////////////////////////////////////////////////
 
+// WARNING: Due to conditional include of different implementations, this file CAN NOT have a
+// #pragma once include guard. It can however have a marco-declared include guard.
 #ifndef SMART_CAST_H
 #define SMART_CAST_H
 
@@ -329,6 +331,6 @@ DECLARE_SPECIALIZATION(CSE_ALifeItemPDA, CSE_Abstract, cast_item_pda);
 #ifndef DO_NOT_DECLARE_TYPE_LIST
 #include "smart_cast_impl1.h"
 #endif
-#endif
+#endif // PURE_DYNAMIC_CAST
 
 #endif // SMART_CAST_H