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)

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    657,
 /**/
     656,
 /**/
@@ -2337,8 +2339,6 @@ list_version(void)
     msg_puts(_("\nBig version "));
 #elif defined(FEAT_NORMAL)
     msg_puts(_("\nNormal version "));
-#elif defined(FEAT_SMALL)
-    msg_puts(_("\nSmall version "));
 #else
     msg_puts(_("\nTiny version "));
 #endif