[MERGE] Streamline _walkdirs_utf8 for utf8 file systems, reducing time to traverse a mozilla tree from 1s to .6 seconds. (Robert Collins)

[Robert Collins]

So, this is an updated patch of the one John tweaked to work on windows.
The windows stuff has not been changed further, so it should still work
fine.

Its faster :)

Before, I see 1000ms to walkdirs a mozilla tree, with it, I see 612ms.
In 'st' terms, thats 3.84 seconds down to 3.34. Or half a second saved,
~14% total time reduction.

Enjoy.

-Rob

-- 
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