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/ex_cmds.c b/src/ex_cmds.c
index a5eae8d..3c13b8d 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -2739,12 +2739,11 @@
 	if (buf != curbuf)
 	{
 	    bufref_T	save_au_new_curbuf;
-#ifdef FEAT_CMDWIN
 	    int		save_cmdwin_type = cmdwin_type;
 
 	    // BufLeave applies to the old buffer.
 	    cmdwin_type = 0;
-#endif
+
 	    /*
 	     * Be careful: The autocommands may delete any buffer and change
 	     * the current buffer.
@@ -2760,9 +2759,7 @@
 	    save_au_new_curbuf = au_new_curbuf;
 	    set_bufref(&au_new_curbuf, buf);
 	    apply_autocmds(EVENT_BUFLEAVE, NULL, NULL, FALSE, curbuf);
-#ifdef FEAT_CMDWIN
 	    cmdwin_type = save_cmdwin_type;
-#endif
 	    if (!bufref_valid(&au_new_curbuf))
 	    {
 		// new buffer has been deleted