test_thread.rb: skip test_thread.rb broken for Windows

msys2.

https://ci.appveyor.com/project/ruby/ruby/builds/20419607/job/fuvrfcmrhxr1r1cr
https://ci.appveyor.com/project/ruby/ruby/builds/20395349/job/2nqewb06b5eanwea
https://ci.appveyor.com/project/ruby/ruby/builds/20382452/job/658pvl1cqolyrixm

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65820 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bootstraptest/pending.rb

@@ -37,3 +37,11 @@ assert_normal_exit %q{
   r.instance_eval { initialize r, r }
   r.inspect
 }
+
+# This test randomly fails on AppVeyor msys2 with:
+# test_thread.rb: A non-blocking socket operation could not be completed immediately. - read would block
+assert_finish 3, %{
+  th = Thread.new {sleep 0.2}
+  th.join(0.1)
+  th.join
+}

bootstraptest/test_thread.rb

@@ -248,12 +248,6 @@ assert_equal 'ok', %{
   $result
 }
 
-assert_finish 3, %{
-  th = Thread.new {sleep 0.2}
-  th.join(0.1)
-  th.join
-}
-
 assert_finish 3, %{
   require 'timeout'
   th = Thread.new {sleep 0.2}