Fix issue 13370: Ensure that ctypes works on Mac OS X when Python is compiled using the clang compiler

Patch by Chris Rebert.

Closes #9374: add back now-unused module attributes; removing them is a backward compatibility issue, since they have a public-seeming name.

(Patch by Ronald Oussoren)

2.7 doesn't support 'a'.  This changeset ports the doc change
and clause-reording portions of Francisco Martín Brugué patch
in order to minimize code base drift.

Patch by Kushal Das.

Patch by Chris Jerdonek.

Patch by Serhiy Storchaka.

Patch by Chris Jerdonek.

Based on patch by Chris Jerdonek.

Patch by Yury Selivanov.

on Windows without the "if __name__ == '__main__'" idiom.

Patch by Michael Johnson.

Fix #15496. Add directory removal helpers to make Windows tests more reliable. Patch by Jeremy Kloth

Patch by Chris Jerdonek.

Daniel Ellis.