d48ffea939
This implements a custom build backend, inspired by the [solution used by Pillow.](https://github.com/python-pillow/Pillow/pull/7171) install-option is deprecated and was removed with pip 23.1. The comonly accepted solution seems to be to define a custom build backend for now https://github.com/pypa/setuptools/issues/2491#issuecomment-1589764230 This commit changes the usage from `--install-option` to `--config-settings`.