[MERGE] sftp transport: do not chmod a dir when unecessary (fix suid and sgid problems).

[Aaron Bentley]

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John Arbash Meinel wrote:
> I'm interested in reviewing this, do we know why BB didn't find it?

It seems like it did find it:
http://bundlebuggy.aaronbentley.com/request/<20080709.115028.572522674361770034.Christophe.Troestler%40umh.ac.be>

Aaron
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