patch 9.0.0657: too many #ifdefs

Problem:    Too many #ifdefs.
Solution:   Graduate the +cmdwin feature.  Now the tiny and small builds are
            equal, drop the small build.  (Martin Tournoij, closes #11268)
diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index 736d1c7..58b7931 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -3311,11 +3311,7 @@
 
 	// When ignoring events return TRUE so that the selected page doesn't
 	// change.
-	if (hold_gui_events
-# ifdef FEAT_CMDWIN
-		|| cmdwin_type != 0
-# endif
-	   )
+	if (hold_gui_events || cmdwin_type != 0)
 	    return TRUE;
 
 	tabwin = gui_gtk_window_at_position(gui.mainwin, &x, &y);