Otherwise, stray registry entries would cause issues.
Also fixes an accelerator collision and improves UAC icons when upgrading.

already supports reduce protocol 4 (issue #20289).

already supports reduce protocol 4 (issue #20289).

base64.b64encode() uses it to avoid a memory copy.

Fix usage of support.import_module('asyncio'): store the result in an 'asyncio'
variable.

* Fix accumulate_result(): don't use time on interrupted and failed test
* Add unit test for interrupted test
* Add unit test on --slow with interrupted test, with and without
  multiprocessing

Skip test_asyncio_1() when the asyncio module cannot be imported because
CPython is compiled with no thread support.

Check also that the deprecation warning is emited.

Add "#ifdef WITH_THREAD" around cals to:

* PyGILState_Check()
* _PyImport_AcquireLock()
* _PyImport_ReleaseLock()

Add "#ifdef WITH_THREAD" around cals to:

* PyGILState_Check()
* _PyImport_AcquireLock()
* _PyImport_ReleaseLock()

Patch by Nir Soffer.

can now be pickled using pickle protocols older than protocol version 4.