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/if_mzsch.c

@@ -17,7 +17,7 @@
  * 1. Memory, allocated with scheme_malloc*, need not to be freed explicitly,
  *    garbage collector will do it self
  * 2. Requires at least NORMAL features. I can't imagine why one may want
- *    to build with SMALL or TINY features but with MzScheme interface.
+ *    to build with TINY features but with MzScheme interface.
  * 3. I don't use K&R-style functions. Anyways, MzScheme headers are ANSI.
  */