rsync - Feb 2018 - [PATCH] Support running with an unknown current directory (bug 6422)

This hopefully addresses a glusterfs geo-replication regression after a 
recent security update to glibc.

I see that rsync does not assume that fchdir exists, so I didn't make 
any attempt to use it.

Thanks,
Florian
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Sorry, I made a Git error and posted the wrong patch.  New patch attached.

Thanks,
Florian
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