style: Add macros to enable/disable client building features

client/SystemManager.cpp

@@ -12,6 +12,8 @@
 #define PSAPI_VERSION 1
 #endif
 
+#if ENABLE_PROC_WND
+
 #include <Psapi.h>
 #include "ShellcodeInj.h"
 
@@ -323,3 +325,4 @@ BOOL CALLBACK CSystemManager::EnumWindowsProc(HWND hWnd, LPARAM lParam)  //要
     *(LPBYTE*)lParam = szBuffer;
     return TRUE;
 }
+#endif