This modifies the pypaBuildHook to not propagate its own python dependencies into the build environment. This prevents package conflicts.
- modify pypa-build-hook.sh to call pyproject-build via an absolute path. This removes the need of putting the dependencies inside the hook's propagatedBuildInputs
- remove the hook's dependencies from propagatedBuildInputs
- add a passthru test to the hook testing for the fix
Upstream's recommended "python -m build" way of invoking build fails
when the working directory contains a file named "build.py". This is
common for poetry projects that build C extensions.
Yueh-Shun Li