[Patch] Add name_to_handle_at and open_by_handle_at for PowerPC

[Jeff Law <law at redhat dot com>]

Back in April 2011 Uli added support for open_by_handle_at and 
name_to_handle_at.  Unfortunately, he failed to add the prototypes to 
the powerpc specific fcntl.h header file.

I just copied the prototype from another port; from a quick glance, they 
all look the same and ideally we'd have the prototypes in just one 
location.  Presumably Uli put them in the port specific fcntl.h for some 
good reason.

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