wip: add test for build behaviour across python/setuptools versions#1124

RonnyPfannschmidt wants to merge 2 commits intopypa:mainpypa/setuptools-scm:mainfrom

RonnyPfannschmidt:verify-old-setuptools-python-combinatonsRonnyPfannschmidt/setuptools_scm:verify-old-setuptools-python-combinatonsCopy head branch name to clipboard