variable.c: exclude private constants
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55705 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
variable.c: exclude private constants
when excluding inherited constants too. [Bug #12345]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55705 b2dd03c8-39d4-4d8f-98ff-823fe69b080e