* test/minitest/test_minitest_unit.rb: removed obsoleted condition
  for Ruby 1.8.
* test/ruby/test_time_tz.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e