Fix the new test on windows (skip it, its posix only)
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index 4e45e11..d9b5424 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -774,6 +774,7 @@
 
 
 class HelperFunctionTests(unittest.TestCase):
+    @unittest.skipIf(mswindows, "errno and EINTR make no sense on windows")
     def test_eintr_retry_call(self):
         record_calls = []
         def fake_os_func(*args):