merge revision(s) 44880: [Backport #9477]

	* lib/resolv.rb: Ignore name servers which cause EAFNOSUPPORT on
	  socket creation.
	  Reported by Bjoern Rennhak.  [ruby-core:60442] [Bug #9477]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@45110 b2dd03c8-39d4-4d8f-98ff-823fe69b080e