gh-111201: Skip pyrepl Windows tests earlier

[vstinner]

Don't attempt to load pyrepl Windows console if platforms others than Windows. For example, the import can fail if ctypes is missing.

• Issue: A new Python REPL #111201

[vstinner]

Example of failiure on FreeBSD where _ctypes extension is missing: https://buildbot.python.org/all/#/builders/1232/builds/2462

0:10:59 load avg: 3.41 [403/478/1] test_pyrepl failed (uncaught exception) Failed to import test module: test.test_pyrepl.test_windows_console Traceback (most recent call last): File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/unittest/loader.py", line 396, in _find_test_path module = self._get_module_from_name(name) File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/unittest/loader.py", line 339, in _get_module_from_name __import__(name) ~~~~~~~~~~^^^^^^ File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/test/test_pyrepl/test_windows_console.py", line 5, in <module> from _pyrepl.windows_console import ( ...<5 lines>... ) File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/_pyrepl/windows_console.py", line 30, in <module> import ctypes File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/ctypes/__init__.py", line 8, in <module> from _ctypes import Union, Structure, Array ModuleNotFoundError: No module named '_ctypes' test test_pyrepl crashed -- Traceback (most recent call last): File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/test/libregrtest/single.py", line 181, in _runtest_env_changed_exc _load_run_test(result, runtests) ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/test/libregrtest/single.py", line 138, in _load_run_test regrtest_runner(result, test_func, runtests) ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/test/libregrtest/single.py", line 91, in regrtest_runner test_result = test_func() File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/test/libregrtest/single.py", line 135, in test_func return run_unittest(test_mod) File "/home/buildbot/buildarea/3.x.opsec-fbsd14/build/Lib/test/libregrtest/single.py", line 35, in run_unittest raise Exception("errors while loading tests") Exception: errors while loading tests 

[AlexWaygood]

FYI, I think that that buildbot failure was already fixed an hour ago, in #119834

[bedevere-app]

GH-119924 is a backport of this pull request to the 3.13 branch.