EFI support added

EFI support added

BIOS is going to die…

- grub-install.in.patch patch dropped:
  – no need for all this files on the /boot partition whenever the grub
    package is installed
  - /boot is populated by 'grub-install' as neccessary
  – we need separate directories for separate platforms
– multiple platforms may be built from the spec at once
– 'pc' and 'efi' subpackages added, each for one platform