python-future-src: Clean single-source support for Python 3 and 2 (source)

    2019-06-06 10:03           0 python-future-0.17.1-1.src/
    2019-06-06 10:03      829119 python-future-0.17.1-1.src/future-0.17.1.tar.gz
    2019-06-06 10:03         523 python-future-0.17.1-1.src/python-future.cygport