resolv/test_addr.rb: require tempfile for new test in r44312

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44321 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: tmm1

test/resolv/test_addr.rb

@@ -1,6 +1,7 @@
 require 'test/unit'
 require 'resolv'
 require 'socket'
+require 'tempfile'
 
 class TestResolvAddr < Test::Unit::TestCase
   def test_invalid_ipv4_address