Fix namedtuple bug reported by Glenn Linderman.  Template did not form correctly if the field names were input in Unicode.

and if the filename is a unicode string.

Reviewed by Martin von Loewis.

reviewers: Georg, Benjamin

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.