gh-108765: Python.h no longer includes <ctype.h>

[vstinner]

Remove <ctype.h> in C files which don't use it; only sre.c and _decimal.c still use it.

Remove _PY_PORT_CTYPE_UTF8_ISSUE code from pyport.h:

• Code added by commit b5047fd in 2004 for MacOSX and FreeBSD.
• Test removed by commit 52ddaef in 2007, since Python str type now uses locale independent functions like Py_ISALPHA() and Py_TOLOWER() and the Unicode database.

Modules/_sre/sre.c replaces _PY_PORT_CTYPE_UTF8_ISSUE with new functions:

• sre_isalnum()
• sre_tolower()
• sre_toupper()

Remove unused includes:

• _localemodule.c: remove <stdio.h>.
• getargs.c: remove <float.h>.
• dynload_win.c: remove <direct.h>, it no longer calls _getcwd() since commit fb1f68e (in 2001).

• Issue: C API: Cleanup header files #108765

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📚 Documentation preview 📚: https://cpython-previews--108831.org.readthedocs.build/

[vstinner]

I merged my PR.

If it causes too many trouble in 3rd party C extensions (require to update too many C extensions before Python 3.13 beta1), I can make this change conditional only in the limited C API version 3.13.

See also my PR removing <unistd.h>: PR #108783.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows11 Non-Debug 3.x has failed when building commit 03c4080.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/914/builds/2761) and take a look at the build logs.
4. Check if the failure is related to this commit (03c4080) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/914/builds/2761

Failed tests:

• test.test_concurrent_futures.test_shutdown
• test.test_concurrent_futures.test_deadlock

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "b:\uildarea\3.x.ware-win11.nondebug\build\Lib\test\support\os_helper.py", line 480, in temp_dir
    yield path
  File "b:\uildarea\3.x.ware-win11.nondebug\build\Lib\test\support\os_helper.py", line 533, in temp_cwd
    yield cwd_dir
  File "b:\uildarea\3.x.ware-win11.nondebug\build\Lib\test\libregrtest\main.py", line 802, in main
    self._main(tests, kwargs)
  File "b:\uildarea\3.x.ware-win11.nondebug\build\Lib\test\libregrtest\main.py", line 861, in _main
    sys.exit(0)
SystemExit: 0


Traceback (most recent call last):
  File "b:\uildarea\3.x.ware-win11.nondebug\build\Lib\test\support\__init__.py", line 207, in _force_run
    return func(*args)
           ^^^^^^^^^^^
PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'B:\\uildarea\\3.x.ware-win11.nondebug\\build\\build\\test_python_4856�\\test_python_worker_13508�'