* multiprocessing: open file with closefd=False to avoid ResourceWarning
* _test_multiprocessing: open file with O_EXCL to detect bugs in tests (if a
  previous test forgot to remove TESTFN)
* test_sys_exit(): remove TESTFN after each loop iteration

Initial patch written by Serhiy Storchaka.

Use -Wd comment line option to log the ResourceWarning.

Issue #26161: Use Py_uintptr_t instead of void* for atomic pointers in
pyatomic.h. Use atomic_uintptr_t when <stdatomic.h> is used.

Using void* causes compilation warnings depending on which implementation of
atomic types is used.

Declare the function even if thread support is disabled.

Issue #21925: warnings.formatwarning() now catches exceptions on
linecache.getline(...) to be able to log ResourceWarning emitted late during
the Python shutdown process.

test_warnings: only run test_improper_option() and test_warnings_bootstrap()
once. The unit test doesn't depend on self.module.

Issue #26588: Enhance assertion in set_reentrant()

Issue #26588: Fix _tracemalloc start/stop: don't play with the reentrant flag.

set_reentrant(1) fails with an assertion error if tracemalloc_init() is called
first in a thread A and tracemalloc_start() is called second in a thread B. The
tracemalloc is imported in a thread A. Importing the module calls
tracemalloc_init(). tracemalloc.start() is called in a thread B.

uuid.uuid4() always uses os.urandom() after 756d040aa8e8.

Patch by jgauthier.

Patch by Andrew Szeto.

Without the patch, line 1010 of Lib/datetime.py wasn't covered
by the test suite.

Patch by Colin Williams.

Initial patch by Peter Inglesby.

#26250: document the sqlite3.Cursor.connection attribute.  Initial patches by Aviv Palivoda and Varpu Rantala.

configure script related to compiler flags.

Thanks to Daniel Shaulov for the bug report and patch.

Patch by SilentGhost.

files cannot be written.

Issue #26569: Fix pyclbr.readmodule() and pyclbr.readmodule_ex() to support
importing packages.

Issue #26563: Py_FatalError: disable faulthandler before trying to flush
sys.stdout and sys.stderr.

Issue #26563: Replace PyMem_Malloc() with PyMem_RawFree() since
PostToQueueCallback() calls PyMem_RawFree() (previously PyMem_Free()) in a new
C thread which doesn't hold the GIL.

Issue #26564. Cleanup the code, lineno is never negative.

Issue #26558.