[Bug 217447] textproc/py-sphinx: Fails with python:3.3+

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217447

            Bug ID: 217447
           Summary: textproc/py-sphinx: Fails with python:3.3+
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: kmoore at FreeBSD.org
          Reporter: dbaio at bsd.com.br
                CC: freebsd-python at FreeBSD.org
             Flags: maintainer-feedback?(kmoore at FreeBSD.org), exp-run?
          Assignee: kmoore at FreeBSD.org

Created attachment 180389
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180389&action=edit
py-sphinx-python3-error.patch

To reproduce it just set python 3.5 as default and execute a poudriere
testport.
   DEFAULT_VERSIONS+=      python=3.5
   $ poudriere testport ... -o textproc/py-sphinx

>cd /wrkdirs/usr/ports/textproc/py3-sphinx/work/Sphinx-1.4.8/build/lib &&
>/usr/bin/env PYTHONPATH=/wrkdirs/usr/ports/textproc/py3-sphinx/work/Sphinx-1.4.8/build/lib:/usr/local/lib/python3.5/site-packages
>/usr/local/bin/python3.5 -m sphinx.pycode.pgen2.driver -c 'import load_grammar'
>/usr/local/lib/python3.5/runpy.py:125: RuntimeWarning: 'sphinx.pycode.pgen2.driver' found in
>sys.modules after import of package 'sphinx.pycode.pgen2', but prior to execution of
>'sphinx.pycode.pgen2.driver'; this may result in unpredictable behaviour
>  warn(RuntimeWarning(msg))

Removing post-build block fixes this.

This was introduced in ports r336515 version 1.2 and then on version 1.2.1
this caught my attention:

* #1152: Fix pycode parsing errors of Python 3 code by including two grammar
  versions for Python 2 and 3, and loading the appropriate version for the
running Python version.
https://github.com/sphinx-doc/sphinx/blob/master/CHANGES#L1687-L1689

I did some tests with this attached patch and couldn't find any problem, but
another eye on it will be great... and maybe an exprun...

Regards.

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