Issue #13193: Fix distutils.filelist.FileList and packaging.manifest.Manifest under Windows.  The "recursive-include" directive now recognizes both legal path separators.
Issue #13193: Fix distutils.filelist.FileList and
packaging.manifest.Manifest under Windows.  The "recursive-include"
directive now recognizes both legal path separators.

pypa/setuptools,pypa/setuptools,pypa/setuptools