[issue15845] Fixing some byte-to-string conversion warnings

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> This will raise an error if curdir is a non-ascii str, so, unless the same error was already raised later in the code, this is backward incompatible.

On all supported platforms curdir is a ascii str (':' on Mac Classic, '.' on all other). The same idiom used in glob module.

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<http://bugs.python.org/issue15845>
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