Fixing #698914 for wheezy (grub booting Windows 8 via UEFI)

[Steve McIntyre]

Hi folks,

I opened #698914 a while back, concerned about the lack of support in
grub and os-prober for detecting Windows 8 on UEFI systems so that
working boot entries would be added automatically at installation
time. At the time, I did not consider the issue RC. However,
discussion yesterday with Wolodja Wentland suggests that this is
becoming a more common problem than I feared, and users are tripping
over this and asking for support on #debian and elsewhere. I'm
thinking that this bug should therefore be considered RC for the
Wheezy r0 release at this point.

He pointed me at an existing set of patches from the folks at
openSUSE, which I've adapted very slightly and tested out:

 * Using an existing installation
 * Using a locally-built CD to test the os-prober udeb

and all works fine, fixing the bug nicely. I would like to upload (and
get unblocks for) new grub2 and os-prober packages - see debdiffs of
changes attached. The changes are quite small and targeted, only
affecting code paths for EFI systems.

What do you think?

-- 
Steve McIntyre, Cambridge, UK.                                steve at einval.com
You raise the blade, you make the change... You re-arrange me 'til I'm sane...
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