bridge-utils: Fix compilation error with kernel 3.8.

Also move brctl from /sbin to /usr/sbin (UsrMove).
grub: Remove EFI version.

Don't build the EFI version of GRUB any more, because we don't
want to use GRUB for this.
gnu-efi: New package.

Requirement for gummiboot.
gummiboot: New package.
Merge branch 'master' of ssh://git.ipfire.org/pub/git/ipfire-3.x