* ext/socket/extconf.rb: Don't check fields of struct tcp_info if the
  structure is not available.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46024 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-05-20

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46025 b2dd03c8-39d4-4d8f-98ff-823fe69b080e