grub2: Two fixes

This update fixes the following issues with grub2:

- bnc#811608: fixed potential failure of chainloading efi loader in secureboot enabled mode
- bnc#809038: corretly set chainloaded image device handle in secure boot mode
- fixed ppc-build

Fixed bugs
bnc#811608
Grub2 chainloader failed to boot xen on Intel tunnel mountain if secure boot enabled
bnc#809038
EFI problems - cannot boot windows with secure boot
Selected Binaries
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