ruby.h: deprecate plain Data

* include/ruby/ruby.h (rb_data_object_alloc_deprecated): deprecate
  Data_Make_Struct and Data_Wrap_Struct.  [EXPERIMENTAL]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47717 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-09-27

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47718 b2dd03c8-39d4-4d8f-98ff-823fe69b080e