Much of bpo-29521 was fixed in parallel with commit
e7ffb99 . This cleans up the rest.
Apply parallel change to Doc/make.bat to read
"set SPHINXOPTS=-D latex_elements.papersize="
I don't have a Windows system on which to observe the warning,
but it should be necessary.
The warning:
.../workspace/cpython_github/Doc/faq/windows.rst:303:
WARNING: unknown option: -t
In the Windows FAQ, `How do I keep editors from inserting tabs
into my Python source?`, contained a reference to a Python -t
option. In Python 2.x, this caused Python to issue warnings
about lines with mixed spaces and tabs, but as of Python 3.6
it does nothing.
Per discussion at http://bugs.python.org/issue29387, take
their wording. Python [3] raises an IndentationError or
TabError. Tabnanny is now a module.
(cherry picked from commit 3d707be950)
Nowadays it is likely that people will have Sphinx installed,
and if not, they will know how to install it.
This also simplifies life a lot for distribution packagers,
who typically do not want the doc build process to connect
to external web resources.
If PYTHON is undefined, this fails without the launcher (installed with 3.3 or
from PyPI), but this is better than always failing. Patch from Zachary Ware.
