patch 8.0.0320: warning for unused variable with small build

Problem:    Warning for unused variable with small build.
Solution:   Change #ifdef to exclude FEAT_CMDWIN. (Kazunobu Kuriyama)
diff --git a/src/ex_getln.c b/src/ex_getln.c
index 4365100..c498e00 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -212,8 +212,7 @@
 #endif
     expand_T	xpc;
     long	*b_im_ptr = NULL;
-#if defined(FEAT_WILDMENU) || defined(FEAT_EVAL) \
-    || defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CMDWIN)
+#if defined(FEAT_WILDMENU) || defined(FEAT_EVAL) || defined(FEAT_SEARCH_EXTRA)
     /* Everything that may work recursively should save and restore the
      * current command line in save_ccline.  That includes update_screen(), a
      * custom status line may invoke ":normal". */