bpo-30778: Skip test_bsddb3 on Windows XP (#2877)

* bpo-30778: Skip test_bsddb3 on Windows XP

* Fix if, don't skip Windows Vista

Lib/test/test_bsddb3.py

@@ -28,6 +28,10 @@ if 'silent' in sys.argv:  # take care of old flag, just in case
     verbose = False
     sys.argv.remove('silent')
 
+# bpo-30778: test_bsddb3 crashs randomly on Windows XP
+if hasattr(sys, 'getwindowsversion') and sys.getwindowsversion()[:2] < (6, 0):
+    raise unittest.SkipTest("bpo-30778: skip tests on Windows XP")
+
 
 class TimingCheck(unittest.TestCase):