tool/vcs.rb: discard error messages
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45203 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
tool/vcs.rb: discard error messages
VCS not only SVN.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45203 b2dd03c8-39d4-4d8f-98ff-823fe69b080e