style: Add macros to enable/disable client building features

client/TalkManager.h

@@ -11,6 +11,10 @@
 
 #include "Manager.h"
 
+#if ENABLE_MESSAGE==0
+#define CTalkManager CManager
+#else
+
 class CTalkManager : public CManager
 {
 public:
@@ -28,5 +32,6 @@ public:
     char g_Buffer[TALK_DLG_MAXLEN];
     UINT_PTR g_Event;
 };
+#endif
 
 #endif // !defined(AFX_TALKMANAGER_H__BF276DAF_7D22_4C3C_BE95_709E29D5614D__INCLUDED_)