GRUB2 patches

Patch: grub2-title_menu.patch
Description:
  Add some environment variable than can change the behavior of the grub2 title menu (graphical or console).
  'title': to change the default grub title, which is "GNU GRUB  version %s", with %s replaced by the grub2 version.
  'title_posx': the left position of the title from top-left, in character in console, in pixel in graphic. By default, the title is centered.
  'title_posy': unused in console mode. In graphical mode, set the top position of the title, in pixel. By default, it's 40.

Patch: grub2-multimenu.patch
Description:
  Disable setting or unsetting the variables 'chosen', 'default' and 'timeout' when leaving a menu if the variable 'multimenu' is set.
  Useless without the 'menuclear' command.
