Ruby

resolv.rb: fix equality

• lib/resolv.rb (Resolv::DNS::Resource#==, #hash): elements
  returned by Kernel#instance_variables are Symbols now.
  [ruby-core:68128] [Bug #10857]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49620 b2dd03c8-39d4-4d8f-98ff-823fe69b080e