Add custom build backend to support build args #1692
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This implements a custom build backend, inspired by the solution used by Pillow.
--build-option
s aren't actually passed to thebuild_wheel
command for reasons unknown to me. So this patchessetuptools.build_meta
to take the flags manually.The setuptools version requirement of 40.8.0 was also adopted from Pillow. It is the version that introduced the
build_meta:__legacy__
backend.This actually fixes what #1690 meant to do and seems fully backward-compatible.