Enable more Time TZ tests on OpenBSD

test/ruby/test_time_tz.rb

@@ -9,7 +9,7 @@ class TestTimeTZ < Test::Unit::TestCase
   case RUBY_PLATFORM
   when /linux/
     force_tz_test = true
-  when /darwin|freebsd/
+  when /darwin|freebsd|openbsd/
     has_lisbon_tz = false
     force_tz_test = true
   end