Re-apply r43023 which is accidentally reverted by r47598

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47615 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

enc/utf_16_32.h

@@ -1,5 +1,5 @@
 #include "regenc.h"
 /* dummy for unsupported, statefull encoding */
-#define ENC_DUMMY_UNICODE(name) ENC_DUMMY(name)
+#define ENC_DUMMY_UNICODE(name) ENC_REPLICATE(name, name "BE")
 ENC_DUMMY_UNICODE("UTF-16");
 ENC_DUMMY_UNICODE("UTF-32");