* test/csv/test_features.rb (TestCSV#test_gzip_reader_bug_fix): test
  only if zlib is available.

* test/csv/test_features.rb (TestCSV#test_gzip_writer_bug_fix): ditto.

* test/open-uri/test_open-uri.rb (TestOpenURI#test_content_encoding):
  ditto.

* test/rexml/test_order.rb (OrderTester#test_more_ordering): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35592 b2dd03c8-39d4-4d8f-98ff-823fe69b080e