This package fails to build with newer setuptools, because setuptools
removed the (deprecated) Features feature in v46.0.0[1].
This adapts a commit[2] to remove the use of this feature. (Changes to
code formatting prevent the original commit/patch to be used.)
[1]: aff64ae89e/CHANGES.rst (v4600)
[2]: 3aac426e35
Signed-off-by: Jeffery To <jeffery.to@gmail.com>
