fix guard

Author: maxbachmann

Modules/posixmodule.c

@@ -5726,7 +5726,7 @@ os_mkdir_impl(PyObject *module, path_t *path, int mode, int dir_fd)
 
 #ifdef MS_WINDOWS
     Py_BEGIN_ALLOW_THREADS
-#if defined(MS_WINDOWS_DESKTOP) || defined(MS_WINDOWS_SYSTEM)
+#if defined(MS_WINDOWS_APP) || defined(MS_WINDOWS_SYSTEM)
     if (mode == 0700 /* 0o700 */) {
         ULONG sdSize;
         pSecAttr = &secAttr;