Add Process.argv0.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42426 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Add Process.argv0.
of $0. [Feature #8696]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42426 b2dd03c8-39d4-4d8f-98ff-823fe69b080e