[issue3080] Full unicode import system

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> test_runpy fails on Windows on make_legacy_pyc() (of test.support),
> I don't know why.

Gotcha: I replaced mkdir() by CreateDirectoryW(), but the "directory already exists" error was not ignored. Fixed by 2debe178697b.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3080>
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