grub-probe on powerpc

[Robert Millan]

update-grub needs grub-probe to run, which is only available in i386.

In principle, this file should be portable.  I made this patch (currently
applied in debian) to enable it on powerpc as well.  However, it seems to
have runtime errors (detects size of hd0 as 0 bytes) that I can't debug
(because I lack the hardware).

Maybe someone can give it a try?

-- 
Robert Millan

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powerpc_probe.diff
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