[3.14] Revert "gh-80334: fix multiprocessing.freeze_support for other spawn platforms (GH-134462) (#134619)

[hugovk]

This reverts commit 00fd544.

• Issue: Freeze support documentation is misleading. #80334

---

📚 Documentation preview 📚: https://cpython-previews--134658.org.readthedocs.build/

[hugovk]

!buildbot windows

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @hugovk for commit 0978de2 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F134658%2Fmerge

The command will test the builders whose names match following regular expression: windows

The builders matched are:

• AMD64 Windows11 Refleaks PR
• AMD64 Windows PGO NoGIL PR
• AMD64 Windows10 PR
• AMD64 Windows Server 2022 NoGIL PR
• AMD64 Windows PGO PR
• ARM64 Windows Non-Debug PR
• ARM64 Windows PR
• AMD64 Windows11 Non-Debug PR
• AMD64 Windows11 Bigmem PR

[hugovk]

This isn't the cause, it also fails in the same way:

======================================================================
FAIL: test_search_major_2 (test.test_launcher.TestLauncher.test_search_major_2)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Users\Administrator\buildarea\pull_request.itamaro-win64-srv-22-aws.x64.nogil\build\Lib\test\test_launcher.py", line 465, in test_search_major_2
    self.assertEqual("PythonCore", data["env.company"])
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 'PythonCore' != 'PythonTestSuite'
- PythonCore
+ PythonTestSuite