Closes #19477: remove outdated documentation of tp_print type object slot.

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branch : 3.4
extra : rebase_source : b7c1b8e25538b6ae74fd5d8365b1f8150b534927
Issue #22290: Fix error handling in the _posixsubprocess module.

* Don't call the garbage collector with an exception set: it causes an
  assertion to fail in debug mode.
* Enhance also error handling if allocating an array for the executable list
  failed.
* Add an unit test for 4 different errors in the _posixsubprocess module.

--HG--
branch : 3.4
Issue #22390: Remove files created by tests

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branch : 3.4
extra : amend_source : e6d407c04768be28c938fff72347c65fe2408960
cleanup test_posix

--HG--
branch : 3.4
Closes #21173: Fix len() on a WeakKeyDictionary when .clear() was called with an iterator alive.

--HG--
branch : 3.4