* test/lib/minitest/unit.rb: Use Tempfile#close! instead of
  Tempfile#unlink to close file descriptors.

* test/openssl/test_config.rb: Ditto.

* test/ruby/test_io.rb: Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46189 b2dd03c8-39d4-4d8f-98ff-823fe69b080e