[PATCH,HURD] implement renameat

[Pino Toscano]

Hi,

the attached patch implements renameat for Hurd; it seems to work fine, 
and tst-renameat now passes.
The copyright starts from the year of the rename implementation, as I 
basically copied it and slightly adapted to the "at" behaviour.

Thanks,
-- 
Pino Toscano
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