BUG: fix a bug where calling `distutils.build_ext.finalize_options` more than once would raise an exception#5083

neutrinoceros wants to merge 1 commit intopypa:mainpypa/setuptools:mainfrom

neutrinoceros:enh/build-ext-finalize-options-idempotencyneutrinoceros/setuptools:enh/build-ext-finalize-options-idempotencyCopy head branch name to clipboard