Omit private mapped buffer test on Windows.

ioquatix · ioquatix · commit 075c79807192 · 2023-12-25T00:42:39.000+13:00
diff --git a/test/ruby/test_io_buffer.rb b/test/ruby/test_io_buffer.rb
@@ -519,6 +519,8 @@ def test_shared
   end
 
   def test_private
+    omit if RUBY_PLATFORM.include?("mswin")
+
     Tempfile.create("buffer.txt") do |io|
       io.write("Hello World")
 
