UnicodeDecodeError in easy_install with unicode characters in sdist when LANG=C

[jaraco]

In investigating #704, I added a test which creates an sdist with unicode charecters in one of the filenames. Turns out this test is also failing on Linux when LANG=C.

[jaraco]

As reported in the upstream bug, following the fix for #704, some packages (notably Sphinx, but any package that contains non-ascii filenames) will fail to cleanup after install with a UnicodeDecodeError in rmtree.

It sounds like the recommended fix is to provide a platform-specific workaround to pass bytes to rmtree when on Python 2 and Linux.