- Fix fdupes call

- update to version 40.6.2:
* #1592: Fix invalid dependency on external six module (instead of
vendored version).
- changes from version 40.6.1:
* #1590: Fixed regression where packages without author or
author_email fields generated malformed package metadata.
- changes from version 40.6.0:
* #1541: Officially deprecated the requires parameter in setup().
* #1519: In pkg_resources.normalize_path, additional path
normalization is now performed to ensure path values to a
directory is always the same, preventing false positives when
checking scripts have a consistent prefix to set up on Windows.
* #1545: Changed the warning class of all deprecation warnings;
deprecation warning classes are no longer derived from
DeprecationWarning and are thus visible by default.
* #1554: build_meta.build_sdist now includes setup.py in source
distributions by default.
* #1576: Started monkey-patching get_metadata_version and
read_pkg_file onto distutils.DistributionMetadata to retain the
correct version on the PKG-INFO file in the (deprecated) upload
command.
* #1533: Restricted the recursive-include setuptools/_vendor to
contain only .py and .txt files.
* #1395: Changed Pyrex references to Cython in the documentation.
* #1456: Documented that the rpmbuild packages is required for the
bdist_rpm command.
* #1537: Documented how to use setup.cfg for src/ layouts
* #1539: Added minimum version column in setup.cfg metadata table.