Windows does not know Unix style timezone

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58686 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/rubyspec/optional/capi/time_spec.rb

@@ -34,7 +34,9 @@ describe "CApiTimeSpecs" do
         time = @s.rb_time_num_new(1232141421, nil)
         time.should be_an_instance_of(Time)
         time.to_i.should == 1232141421
-        time.gmt_offset.should == 3600
+        platform_is_not :windows do
+          time.gmt_offset.should == 3600
+        end
       end
     end