--global-option is deprecated

[radarhere]

https://github.com/python-pillow/Pillow/actions/runs/4999985216/jobs/8956875899#step:7:23

DEPRECATION: --build-option and --global-option are deprecated. pip 23.3 will enforce this behaviour change. A possible replacement is to use --config-settings. Discussion can be found at pypa/pip#11859

While we could possibly just remove make inplace

Pillow/Makefile

Lines 58 to 59 in 599979c

	inplace: clean
	python3 -m pip install -e --global-option="build_ext" --global-option="--inplace" .

and --global-option="build_ext", we do still need something to replace our build options.

The possible replacement of --config-settings would involve switching from setuptools to build.

pip releases a new version every 3 months, so pip 23.3 is due out in October, possibly before our scheduled October 15 release for Pillow 10.1. So it would be ideal to figure this out for Pillow 10.

[hugovk]

would involve switching from setuptools to build.

Sounds like a good idea. I expect this would also unblock switching from setup.cfg/setup.py to pyproject.toml, even if that can be a follow up.

pip releases a new version every 3 months, so pip 23.3 is due out in October, possibly before our scheduled October 15 release for Pillow 10.1. So it would be ideal to figure this out for Pillow 10.

👍

[radarhere]

I've created #7171 as a possible solution. See what you think