backward.h: RClassDeprecated

* include/ruby/backward.h (RClassDeprecated): move from
  ruby/ruby.h.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57678 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

include/ruby/backward.h

@@ -1,6 +1,14 @@
 #ifndef RUBY_RUBY_BACKWARD_H
 #define RUBY_RUBY_BACKWARD_H 1
 
+#define RClass RClassDeprecated
+#ifndef __cplusplus
+DEPRECATED_TYPE(("RClass is internal use only"),
+struct RClass {
+    struct RBasic basic;
+});
+#endif
+
 #define DECLARE_DEPRECATED_FEATURE(ver, func) \
     NORETURN(ERRORFUNC(("deprecated since "#ver), DEPRECATED(void func(void))))
 

include/ruby/ruby.h

@@ -910,13 +910,6 @@ struct RObject {
      RCLASS_IV_INDEX_TBL(rb_obj_class(o)) : \
      ROBJECT(o)->as.heap.iv_index_tbl)
 
-#define RClass RClassDeprecated
-#ifndef __cplusplus
-DEPRECATED_TYPE(("RClass is internal use only"),
-struct RClass {
-    struct RBasic basic;
-});
-#endif
 #define RCLASS_SUPER(c) rb_class_get_superclass(c)
 #define RMODULE_IV_TBL(m) RCLASS_IV_TBL(m)
 #define RMODULE_CONST_TBL(m) RCLASS_CONST_TBL(m)