Allow unicode for ctypes Structure field names.

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-89 into branch/default

Created originally on Bitbucket by anntzer (Antony Lee)

Was already merged in Bitbucket before import, marked as merged by the import user

This would not work previously but does now, because setattr does an implicit unicode->bytes conversion:

from __future__ import unicode_literals
from ctypes import *
class S(Structure): _fields_ = [("i", c_int)]

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