Issue when buillding with Python 3.11

[ebrocas]

There is an issue with the build system when I'm trying to install qbindiff from sources in a Python 3.11 virtualenv. It is linked to the pyproject.toml, as there is duplicated information in the setup.py it could come from this.

the full log:

$ pip install '.'
Processing [HOME]/Tools/python-binexport
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  error: subprocess-exited-with-error
  
  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [83 lines of output]
      /tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/config/_apply_pyprojecttoml.py:75: _MissingDynamic: `requires-python` defined outside of `pyproject.toml` is ignored.
      !!
      
              ********************************************************************************
              The following seems to be defined outside of `pyproject.toml`:
      
              `requires-python = '>=3.9'`
      
              According to the spec (see the link below), however, setuptools CANNOT
              consider this value unless `requires-python` is listed as `dynamic`.
      
              https://packaging.python.org/en/latest/specifications/declaring-project-metadata/
      
              To prevent this problem, you can list `requires-python` under `dynamic` or alternatively
              remove the `[project]` table from your file and rely entirely on other means of
              configuration.
              ********************************************************************************
      
      !!
        _handle_missing_dynamic(dist, project_table)
      /tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/config/_apply_pyprojecttoml.py:75: _MissingDynamic: `license` defined outside of `pyproject.toml` is ignored.
      !!
      
              ********************************************************************************
              The following seems to be defined outside of `pyproject.toml`:
      
              `license = 'AGPL-3.0'`
      
              According to the spec (see the link below), however, setuptools CANNOT
              consider this value unless `license` is listed as `dynamic`.
      
              https://packaging.python.org/en/latest/specifications/declaring-project-metadata/
      
              To prevent this problem, you can list `license` under `dynamic` or alternatively
              remove the `[project]` table from your file and rely entirely on other means of
              configuration.
              ********************************************************************************
      
      !!
        _handle_missing_dynamic(dist, project_table)
      /tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/config/_apply_pyprojecttoml.py:82: SetuptoolsWarning: `install_requires` overwritten in `pyproject.toml` (dependencies)
        corresp(dist, value, root_dir)
      Traceback (most recent call last):
        File "[HOME]/.virtualenvs/binexport/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 353, in <module>
          main()
        File "[HOME]/.virtualenvs/binexport/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 335, in main
          json_out['return_val'] = hook(**hook_input['kwargs'])
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "[HOME]/.virtualenvs/binexport/lib/python3.11/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 118, in get_requires_for_build_wheel
          return hook(config_settings)
                 ^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 325, in get_requires_for_build_wheel
          return self._get_build_requires(config_settings, requirements=['wheel'])
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 295, in _get_build_requires
          self.run_setup()
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/build_meta.py", line 311, in run_setup
          exec(code, locals())
        File "<string>", line 7, in <module>
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/__init__.py", line 103, in setup
          return distutils.core.setup(**attrs)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/_distutils/core.py", line 159, in setup
          dist.parse_config_files()
        File "[HOME]/.virtualenvs/binexport/lib/python3.11/site-packages/_virtualenv.py", line 23, in parse_config_files
          result = old_parse_config_files(self, *args, **kwargs)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/dist.py", line 627, in parse_config_files
          pyprojecttoml.apply_configuration(self, filename, ignore_option_errors)
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/config/pyprojecttoml.py", line 67, in apply_configuration
          return _apply(dist, config, filepath)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/config/_apply_pyprojecttoml.py", line 56, in apply
          _apply_project_table(dist, config, root_dir)
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/config/_apply_pyprojecttoml.py", line 82, in _apply_project_table
          corresp(dist, value, root_dir)
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/config/_apply_pyprojecttoml.py", line 211, in _python_requires
          _set_config(dist, "python_requires", SpecifierSet(val))
                                               ^^^^^^^^^^^^^^^^^
        File "/tmp/pip-build-env-4oxnieei/overlay/lib/python3.11/site-packages/setuptools/_vendor/packaging/specifiers.py", line 708, in __init__
          split_specifiers = [s.strip() for s in specifiers.split(",") if s.strip()]
                                                 ^^^^^^^^^^^^^^^^
      AttributeError: 'NoneType' object has no attribute 'split'
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.

[patacca]

Fixed on #14