* variable.c (rb_const_search): raise with the actual class/module
	  name which defines the private constant.

	* variable.c (rb_const_search): warn with the actual class/module
	  name which defines the deprecated constant.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@56259 b2dd03c8-39d4-4d8f-98ff-823fe69b080e