grub 2.0: several fixes

grub 2.0: several fixes

* Make grub, grub-efi grub_git use a grub2.inc to reduce the duplicated code.

* Make grub and grub-efi use the same patches since they use the same
  source. (grub_git is different).

* grub-efi:
  - Use autotools to replace autotools-brokensep
  - Remove the DEPENDS of freetype, it should be a RDEPENDS.
  - Remove grub-2.00-ignore-gnulib-gets-stupidity.patch since it is a
    duplication of remove-gets.patch.
  - Make grub-efi.rpm contain files rather than make an empty package.

* grub_git:
  - Fix a SSE build failure.

[YOCTO #6310]

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>