patch 8.2.5066: timer_create is not available on every Mac system

Problem:    Timer_create is not available on every Mac system. (Hisashi T
            Fujinaka)
Solution:   Adjust #ifdef.
diff --git a/src/window.c b/src/window.c
index 9b5ac97..992593b 100644
--- a/src/window.c
+++ b/src/window.c
@@ -5188,6 +5188,7 @@
     clear_winopt(&wp->w_allbuf_opt);
 
     vim_free(wp->w_lcs_chars.multispace);
+    vim_free(wp->w_lcs_chars.leadmultispace);
 
 #ifdef FEAT_EVAL
     vars_clear(&wp->w_vars->dv_hashtab);	// free all w: variables