Tighten the restrictions on the test_sys test which triggers a fatal error when
run with tracing turned on.
diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 52e7239..d37651e 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -215,8 +215,8 @@
         self.assertEqual(sys.getrecursionlimit(), 10000)
         sys.setrecursionlimit(oldlimit)
 
-    @unittest.skipIf(sys.gettrace(), 'fatal error if run with a trace function')
-    @test.support.cpython_only
+    @unittest.skipIf(hasattr(sys, 'gettrace') and sys.gettrace(),
+                     'fatal error if run with a trace function')
     def test_recursionlimit_recovery(self):
         # NOTE: this test is slightly fragile in that it depends on the current
         # recursion count when executing the test being low enough so as to