[TD-6169]<fix>: windows dll client can not quit.

src/client/src/tscSystem.c

@@ -200,7 +200,7 @@ void taos_init_imp(void) {
   // In the APIs of other program language, taos_cleanup is not available yet.
   // So, to make sure taos_cleanup will be invoked to clean up the allocated resource to suppress the valgrind warning.
   // But in the dll, the child thread will be killed before atexit takes effect.So taos_cleanup is not necessary.
-#if defined(_UWIN)
+#if !defined(TD_WINDOWS)
   atexit(taos_cleanup);
 #endif