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/version.c b/src/version.c
index a90ab47..884d3a5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    657,
+/**/
     656,
 /**/
     655,
@@ -2337,8 +2339,6 @@
     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