Skip the hang-up test on Windows

Author: nobu

test/ruby/test_thread.rb

@@ -1480,7 +1480,7 @@ def test_thread_native_thread_id_across_fork_on_linux
   end
 
   def test_thread_interrupt_for_killed_thread
-    pend "hang-up" if RUBY_PLATFORM.include?("mingw")
+    pend "hang-up" if /mswin|mingw/ =~ RUBY_PLATFORM
 
     opts = { timeout: 5, timeout_error: nil }
 

tool/test/testunit/test_assertion.rb

@@ -8,6 +8,8 @@ def test_wrong_assertion
   end
 
   def test_timeout_separately
+    pend "hang-up" if /mswin|mingw/ =~ RUBY_PLATFORM
+
     assert_raise(Timeout::Error) do
       assert_separately([], <<~"end;", timeout: 0.1)
         sleep