https://git.ruby-lang.org/ruby.git/commit/?id=ff397d0016

From ff397d0016b515c8a998ece4a73168c0c6061f0e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Wed, 22 Jul 2020 16:18:01 +0900
Subject: dln.h: delete unused codes

defines.h already has them.  Also __cplusplus can never be defined here.

diff --git a/dln.h b/dln.h
index d899963..99106fd 100644
--- a/dln.h
+++ b/dln.h
@@ -13,22 +13,6 @@ https://github.com/ruby/ruby/blob/trunk/dln.h#L13
 
 #include "ruby/defines.h"       /* for RUBY_SYMBOL_EXPORT_BEGIN */
 
-#ifdef __cplusplus
-# ifndef  HAVE_PROTOTYPES
-#  define HAVE_PROTOTYPES 1
-# endif
-# ifndef  HAVE_STDARG_PROTOTYPES
-#  define HAVE_STDARG_PROTOTYPES 1
-# endif
-#endif
-
-#undef _
-#ifdef HAVE_PROTOTYPES
-# define _(args) args
-#else
-# define _(args) ()
-#endif
-
 RUBY_SYMBOL_EXPORT_BEGIN
 
 #ifndef DLN_FIND_EXTRA_ARG
-- 
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