Issue #8263: On freebsd6 the unittest 'break' test stops regrtest; skip it.

This is presumably related to issue 3864, and appears to be due
to a platform bug on freebsd6.

Lib/unittest/test/test_break.py

@@ -12,6 +12,8 @@ import unittest
 
 @unittest.skipUnless(hasattr(os, 'kill'), "Test requires os.kill")
 @unittest.skipIf(sys.platform =="win32", "Test cannot run on Windows")
+@unittest.skipIf(sys.platform == 'freebsd6', "Test kills regrtest on freebsd6 "
+    "if threads have been used")
 class TestBreak(unittest.TestCase):
 
     def setUp(self):