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/Make_vms.mms b/src/Make_vms.mms
index f1689be..4e945e5 100644
--- a/src/Make_vms.mms
+++ b/src/Make_vms.mms
@@ -27,8 +27,7 @@
 DECC = YES
 
 # Build model selection
-# TINY   - Almost no features enabled, not even multiple windows
-# SMALL  - Few features enabled, as basic as possible
+# TINY   - No optional features enabled
 # NORMAL - A default selection of features enabled
 # BIG    - Many features enabled, as rich as possible. (default)
 # HUGE   - All possible features enabled.