Patch by Susumu Koshiba.

Fix a "gcc -pendatic" warning.

Fix a "gcc -pedantic" warning on "buffer += n" because buffer type is void*.

Issue #26839: On Linux, os.urandom() now calls getrandom() with GRND_NONBLOCK
to fall back on reading /dev/urandom if the urandom entropy pool is not
initialized yet. Patch written by Colm Buckley.

Patch by SilentGhost.

- "See also" links to the new docs are now provided in the legacy pages
- links to setuptools documentation have been updated

(original patch by Susan Sun)

Based on patch by Xiang Zhang.

Patch by Xiang Zhang.

Patch by Xiang Zhang.

Original patch by Jelle Zijlstra.

Original patch by Jelle Zijlstra.

If the underlying send() method indicates a partial write, such as when the
call is interrupted to handle a signal, the server would silently drop the
remaining data.

Also add deprecated support for SimpleHandler.stdout.write() doing partial
writes.

[merge from 3.5] - issue27202 - Fix the mistake in changesets 70af472451cb (3.5) and 2bb806539ca6 (3.6)

exclude_patterns in Sphinx conf.py will exclude the .rsts from the build. It
was incorrect exclude 2.x rsts in that.  This fix contributed again Jelle
Zijlstra, excludes doctests in whatsnew/2.7.rst from being exercised by using
doctests skip option.

exclude_patterns in Sphinx conf.py will exclude the .rsts from the build. It
was incorrect exclude 2.x rsts in that.  This fix contributed again Jelle
Zijlstra, excludes doctests in whatsnew/2.7.rst from being exercised by using
doctests skip option.