quote library_dir_option after calling unpatched version

avoids double-quotes if the calling function does the quoting correctly.

Bump `certifi` to version `2016.8.2`

#707 MSVC patch and Python 2

#694 Patch distutils._msvccompiler.library_dir_option

Fix _have_cython

Fix logging using arguments instead of formatter

Fix from @vallsv

In 3c047624, we remove the loop, but we miss to convert the tuple
to a string. Because the exception is just ignored, we don't see
that __import__ won't works

#707
Fix Python 2 Compatibility, and improve registry lookup (Key may not always be in 64bit registry node).

Try to fix #694.

Revert "Ensure that tmpdir is unicode. Fixes #704."

This reverts commit 85794957.

As we can see on https://github.com/pypa/setuptools/issues/709,
this breaks many things (easy_install C extensions, all py3.5 tests,
run with LANG=C).

So instead of fixing in a hurry all new bugs due to this, I propose to
revert this commit until all downsides of this change have been
investigated.

Related bug: https://github.com/pypa/setuptools/issues/709
Related bug: https://github.com/pypa/setuptools/issues/710
Related bug: https://github.com/pypa/setuptools/issues/712