test_etc.rb: fix test_getgrnam for duplicated group names
follow-up: [Bug #6935]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60063 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_etc.rb: fix test_getgrnam for duplicated group names
follow-up: [Bug #6935]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60063 b2dd03c8-39d4-4d8f-98ff-823fe69b080e