git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@32910 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r32242 from trunk into ruby_1_9_2.¶
start with + sign, which means NIS. these are returned in the
case that passwd and group entries in /etc/nsswitch.conf are set
to use "nis" explicitly on Debian. fixed #3683
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@32910 b2dd03c8-39d4-4d8f-98ff-823fe69b080e