[3.8] bpo-38360: macOS: support alternate form of -isysroot flag (GH-16480)#19658

miss-islington merged 1 commit intopython:3.8python/cpython:3.8from

miss-islington:backport-b310700-3.8miss-islington/cpython:backport-b310700-3.8Copy head branch name to clipboard