getaddrinfo.c: GHOST vulnerability check
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49543 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
getaddrinfo.c: GHOST vulnerability check
get rid of GHOST vulnerability on very old platforms.
check for the canonnical name.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49543 b2dd03c8-39d4-4d8f-98ff-823fe69b080e