Move RBIMPL_ATTR_DEPRECATED_* macros to the appropriate header file

Move these macros from include/ruby/backward.h to
include/ruby/internal/attr/deprecated.h, alongside the other similar
macros.

include/ruby/internal/intern/vm.h cannot currently use them because
include/ruby/backward.h is included too late.

Author: rhenium

include/ruby/backward.h

@@ -11,10 +11,6 @@
 #include "ruby/internal/interpreter.h"
 #include "ruby/backward/2/attributes.h"
 
-#define RBIMPL_ATTR_DEPRECATED_SINCE(ver) RBIMPL_ATTR_DEPRECATED(("since " #ver))
-#define RBIMPL_ATTR_DEPRECATED_INTERNAL(ver) RBIMPL_ATTR_DEPRECATED(("since "#ver", also internal"))
-#define RBIMPL_ATTR_DEPRECATED_INTERNAL_ONLY() RBIMPL_ATTR_DEPRECATED(("only for internal use"))
-
 RBIMPL_ATTR_DEPRECATED_INTERNAL_ONLY() void rb_clear_constant_cache(void);
 
 /* from version.c */

include/ruby/internal/attr/deprecated.h

@@ -72,4 +72,11 @@
 # define RBIMPL_ATTR_DEPRECATED_EXT(msg) RBIMPL_ATTR_DEPRECATED(msg)
 #endif
 
+#define RBIMPL_ATTR_DEPRECATED_SINCE(ver) \
+    RBIMPL_ATTR_DEPRECATED(("since " #ver))
+#define RBIMPL_ATTR_DEPRECATED_INTERNAL(ver) \
+    RBIMPL_ATTR_DEPRECATED(("since "#ver", also internal"))
+#define RBIMPL_ATTR_DEPRECATED_INTERNAL_ONLY() \
+    RBIMPL_ATTR_DEPRECATED(("only for internal use"))
+
 #endif /* RBIMPL_ATTR_DEPRECATED_H */

include/ruby/internal/intern/vm.h

@@ -95,7 +95,6 @@ VALUE rb_check_funcall(VALUE recv, ID mid, int argc, const VALUE *argv);
  */
 VALUE rb_check_funcall_kw(VALUE recv, ID mid, int argc, const VALUE *argv, int kw_splat);
 
-#ifdef RBIMPL_ATTR_DEPRECATED_INTERNAL
 /**
  * This API  is practically a  variant of rb_proc_call_kw()  now.  Historically
  * when there  still was a  concept called `$SAFE`, this  was an API  for that.
@@ -112,7 +111,6 @@ VALUE rb_check_funcall_kw(VALUE recv, ID mid, int argc, const VALUE *argv, int k
  */
 RBIMPL_ATTR_DEPRECATED_INTERNAL(4.0)
 VALUE rb_eval_cmd_kw(VALUE cmd, VALUE arg, int kw_splat);
-#endif
 
 /**
  * Identical to rb_funcallv(), except it takes Ruby's array instead of C's.