* Fixed Makefile clean targets to properly handle both files and directories
* Updated build system to use modern ``python -m build`` instead of
deprecated ``python setup.py`` commands
* Fixed linting target to use ``python -m flake8`` for better reliability
* Added flake8 to development dependencies and requirements-test.txt
* Fixed documentation build by adding Sphinx dependencies and using
``python -m sphinx``
* Made Makefile portable by using dynamic make command detection with
``$(shell command -v make)``
* Updated development dependencies to include build tools (build, sphinx,
sphinx-rtd-theme, watchdog)
* Made documentation linkcheck non-fatal to handle broken external
links gracefully
* Improved development workflow with proper dependency management
- Use Python 3.11 on SLE-15 by default
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-abimap?expand=0&rev=18
