remove backward macros

* include/ruby/backward.h (rb_cFixnum, rb_cBignum): remove the
  backward compatibility macros, to fail incompatible extension
  libraries earily.  [Bug #12427]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55413 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Tue Jun 14 23:43:00 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* include/ruby/backward.h (rb_cFixnum, rb_cBignum): remove the
+	  backward compatibility macros, to fail incompatible extension
+	  libraries earily.  [Bug #12427]
+
 Tue Jun 14 22:22:07 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* strftime.c (rb_strftime_with_timespec): limit the result string

include/ruby/backward.h

@@ -17,9 +17,4 @@ ruby_show_copyright_to_die(int exitcode)
     (exit(ruby_show_copyright_to_die(EXIT_SUCCESS)))
 #endif
 
-#ifdef RUBY_INTEGER_UNIFICATION
-# define  rb_cFixnum rb_cInteger
-# define  rb_cBignum rb_cInteger
-#endif
-
 #endif /* RUBY_RUBY_BACKWARD_H */