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

This reverts commit 00fd544.

Author: hugovk

Doc/library/multiprocessing.rst

@@ -1081,7 +1081,7 @@ Miscellaneous
 .. function:: freeze_support()
 
    Add support for when a program which uses :mod:`multiprocessing` has been
-   frozen to produce an executable.  (Has been tested with **py2exe**,
+   frozen to produce a Windows executable.  (Has been tested with **py2exe**,
    **PyInstaller** and **cx_Freeze**.)
 
    One needs to call this function straight after the ``if __name__ ==
@@ -1099,10 +1099,10 @@ Miscellaneous
    If the ``freeze_support()`` line is omitted then trying to run the frozen
    executable will raise :exc:`RuntimeError`.
 
-   Calling ``freeze_support()`` has no effect when the start method is not
-   *spawn*. In addition, if the module is being run normally by the Python
-   interpreter (the program has not been frozen), then ``freeze_support()``
-   has no effect.
+   Calling ``freeze_support()`` has no effect when invoked on any operating
+   system other than Windows.  In addition, if the module is being run
+   normally by the Python interpreter on Windows (the program has not been
+   frozen), then ``freeze_support()`` has no effect.
 
 .. function:: get_all_start_methods()
 

Lib/multiprocessing/context.py

@@ -145,7 +145,7 @@ def freeze_support(self):
         '''Check whether this is a fake forked process in a frozen executable.
         If so then run code specified by commandline and exit.
         '''
-        if self.get_start_method() == 'spawn' and getattr(sys, 'frozen', False):
+        if sys.platform == 'win32' and getattr(sys, 'frozen', False):
             from .spawn import freeze_support
             freeze_support()