Revert "Merge branch 'PR-non-ascii-filenames' of https://github.com/xarx00/GitPython into xarx00-PR-non-ascii-filenames"

This reverts commit 3b13c11, reversing
changes made to da8aeec.

It doesn't pass, unfortunately. Is it a travis issue?
https://travis-ci.org/gitpython-developers/GitPython/jobs/561333763#L340

Author: Sebastian Thiel

git/compat.py

@@ -30,10 +30,7 @@
 is_win = (os.name == 'nt')
 is_posix = (os.name == 'posix')
 is_darwin = (os.name == 'darwin')
-if hasattr(sys, 'getfilesystemencoding'):
-    defenc = sys.getfilesystemencoding()
-if defenc is None:
-    defenc = sys.getdefaultencoding()
+defenc = sys.getdefaultencoding()
 
 if PY3:
     import io

git/repo/base.py

@@ -4,7 +4,6 @@
 # This module is part of GitPython and is released under
 # the BSD License: http://www.opensource.org/licenses/bsd-license.php
 
-from builtins import str
 from collections import namedtuple
 import logging
 import os

requirements.txt

@@ -1,4 +1 @@
 gitdb2 (>=2.0.0)
-gitdb>=0.6.4
-ddt>=1.1.1
-future>=0.9