Issue #15334: skip test_dynamic_key when run in non-interactive mode.

Patch by Jeremy Kloth.

Lib/test/test_winreg.py

@@ -280,6 +280,7 @@ class LocalWinregTests(BaseWinregTests):
                 DeleteKey(key, name)
             DeleteKey(HKEY_CURRENT_USER, test_key_name)
 
+    @unittest.skipUnless('PROMPT' in os.environ, "Requires interactive session")
     def test_dynamic_key(self):
         # Issue2810, when the value is dynamically generated, these
         # throw "WindowsError: More data is available" in 2.6 and 3.1