resolv.rb: no encodings

* lib/resolv.rb (Resolv::Hosts#lazy_initialize): should not
  consider encodings in hosts file.  [ruby-core:59239] [Bug #9273]
* lib/resolv.rb (Resolv::Config.parse_resolv_conf): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44312 b2dd03c8-39d4-4d8f-98ff-823fe69b080e