[Bug #414032] Make the 'sdist' command work when the distribution contains     libraries.  This is done by adding a .get_source_files() method,     contributed by Rene Liebscher and slightly modified. Remove an unused local variable spotted by PyChecker
[Bug #414032] Make the 'sdist' command work when the distribution contains
    libraries.  This is done by adding a .get_source_files() method,
    contributed by Rene Liebscher and slightly modified.
Remove an unused local variable spotted by PyChecker

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator