variable.c: fix receiver on private constant
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63696 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
variable.c: fix receiver on private constant
on private constant, should raise with the included module, not
the ICLASS.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63696 b2dd03c8-39d4-4d8f-98ff-823fe69b080e