Add Python 3.11 support

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• Use PyFrame_GetCode().
• Add PyFrame_GetCode() for Python 3.8 and older.
• Add UWSGI_PY311 macro: defined on Python 3.11 and newer.
• struct uwsgi_python: "current_recursion_depth" becomes
  "current_recursion_remaining" and current_frame type becomes
  _PyCFrame** on Python 3.11.

Related Python 3.11 changes:

• https://docs.python.org/dev/whatsnew/3.11.html#id6
• The PyFrameObject structure became opaque.
• PyThreadState.frame (PyFrameObject) became PyThreadState.cframe
  (_PyCFrame) in Python 3.11.
• PyThreadState: recursion_depth was replaced with
  recursion_remaining + recursion_limit.

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So far, I only checked that uwsgi builds successfully on Python 3.11 :-)

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Fedora issue about uwsgi build issue with Python 3.11: https://bugzilla.redhat.com/show_bug.cgi?id=2099185

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By the way, it would be nice to adapt plugins/python/python_plugin.c to the PyConfig API (PEP 587), to replace deprecated functions: https://docs.python.org/dev/c-api/init_config.html

############## end of uWSGI configuration #############
total build time: 44 seconds
*** uWSGI is ready, launch it with ./uwsgi ***
+ CFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -Wno-unused-but-set-variable'
+ /usr/bin/python3 uwsgiconfig.py --verbose --plugin plugins/python fedora python3
plugins/python/python_plugin.c: In function ‘uwsgi_python_init’:
plugins/python/python_plugin.c:238:17: warning: ‘Py_SetPythonHome’ is deprecated [-Wdeprecated-declarations]
  238 |                 Py_SetPythonHome(wpyhome);
      |                 ^~~~~~~~~~~~~~~~
In file included from /usr/include/python3.11/Python.h:94,
                 from plugins/python/uwsgi_python.h:6,
                 from plugins/python/python_plugin.c:1:
/usr/include/python3.11/pylifecycle.h:40:38: note: declared here
   40 | Py_DEPRECATED(3.11) PyAPI_FUNC(void) Py_SetPythonHome(const wchar_t *);
      |                                      ^~~~~~~~~~~~~~~~
plugins/python/python_plugin.c:262:9: warning: ‘Py_SetProgramName’ is deprecated [-Wdeprecated-declarations]
  262 |         Py_SetProgramName(pname);
      |         ^~~~~~~~~~~~~~~~~
/usr/include/python3.11/pylifecycle.h:37:38: note: declared here
   37 | Py_DEPRECATED(3.11) PyAPI_FUNC(void) Py_SetProgramName(const wchar_t *);
      |                                      ^~~~~~~~~~~~~~~~~
plugins/python/pyutils.c: In function ‘init_pyargv’:
plugins/python/pyutils.c:391:9: warning: ‘PySys_SetArgv’ is deprecated [-Wdeprecated-declarations]
  391 |         PySys_SetArgv(up.argc, up.py_argv);
      |         ^~~~~~~~~~~~~
In file included from /usr/include/python3.11/Python.h:96,
                 from plugins/python/uwsgi_python.h:6,
                 from plugins/python/pyutils.c:1:
/usr/include/python3.11/sysmodule.h:13:38: note: declared here
   13 | Py_DEPRECATED(3.11) PyAPI_FUNC(void) PySys_SetArgv(int, wchar_t **);
      |                                      ^~~~~~~~~~~~~

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Using https://github.com/python/pythoncapi-compat/ here would be interesting here, but I tried to mimick the coding style of the existing uwsgi code.

I can add PyFrame_GetLineNumber() to pythoncapi-compat if you want. Maybe using pythoncapi_compat.h can be done later.

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If you want, you can wait until the downstream patch is merged into Fedora: https://src.fedoraproject.org/rpms/uwsgi/pull-request/11

Fedora is being updated to Python 3.11.

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If you want, you can wait until the downstream patch is merged into Fedora: https://src.fedoraproject.org/rpms/uwsgi/pull-request/11

It got merged: https://src.fedoraproject.org/rpms/uwsgi/c/703b4ef92df1f0058bc07543fde9754de2fecc95?branch=rawhide

[xrmx]

Thanks a lot for the patch and for the heads up!