test_etc.rb: remove implicit assumption
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36625 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_etc.rb: remove implicit assumption
assumption, that getpwuid() would return the first entry in the
order of getpw(), for shared UID. apparently it is not true on
MacOS X 10.8. [ruby-core:46975][Bug #6831]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36625 b2dd03c8-39d4-4d8f-98ff-823fe69b080e