make-snapshot: add fake values
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49258 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
make-snapshot: add fake values
ruby_version which are necessary for Gem.default_dir.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49258 b2dd03c8-39d4-4d8f-98ff-823fe69b080e