Reviewed by Fredrik Lundh and Skip Montanaro.

Reviewed by Nick Coghlan.

Reviewed by Amaury Forgeot d'Arc.

Part of source_os2emx.patch in issue 3868:
  Include/pystrcmp.h:  OS/2 has same C APIs as Windows
  Lib/test/test_io.py: OS/2 has same behaviour as Windows for this test

Reviewed by Amaury Forgeot d'Arc

Part of source_os2emx.patch in issue 3868
Reviewed by Amaury Forgeot d'Arc

Part of source_os2emx.patch in issue 3868
Reviewed by Amaury Forgeot d'Arc

reviewers: Benjamin, Georg

Reviewed by Benjamin Peterson.

Reviewed by Lars Gustäbel.

Windows binaries.

later test failures.  As discussed on #python-dev

We do yell to stderr and the bug is marked as a blocker.
Reviewed by barry in #python-dev.

the improvements seem to be difficult to quantify