[PATCH 11 of 11 py3] extensions: fix extension module hunting on Python 3

[Kevin Bullock]

> On Oct 9, 2016, at 16:16, Augie Fackler <raf at durin42.com> wrote:
> 
> # HG changeset patch
> # User Augie Fackler <augie at google.com>
> # Date 1476019688 14400
> #      Sun Oct 09 09:28:08 2016 -0400
> # Node ID e6a69e778cb02cada23352df512b8580026640d9
> # Parent  e89f400277d564c4a576ad8e4a6003a201993639
> extensions: fix extension module hunting on Python 3
> 
> importlib is a firm believer that paths are really strings, not
> bytes. Fortunately we have os.fsdecode to help us with that.

As I just discovered looking into our current py2.6 breakage on buildbot, importlib doesn't exist at all until 2.7.

Also a question on this series: no test changes in test-check-py3-compat.t?

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Kevin R. Bullock