patch 9.1.0018: use of #if instead of #ifdef
Problem: use of #if instead of #ifdef
Solution: use correct form of #ifdef
`#if FEAT_GUI_HAIKU` was used mistakenly. Use the correct form
`#ifdef FEAT_GUI_HAIKU` instead.
closes: #13843
Signed-off-by: Ken Takata <kentkt@csc.jp>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/structs.h b/src/structs.h
index 3b51e0c..6d77deb 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -4333,7 +4333,7 @@
HMENU submenu_id; // If this is submenu, add children here
HWND tearoff_handle; // hWnd of tearoff if created
#endif
-#if FEAT_GUI_HAIKU
+#ifdef FEAT_GUI_HAIKU
BMenuItem *id; // Id of menu item
BMenu *submenu_id; // If this is submenu, add children here
# ifdef FEAT_TOOLBAR