Log Message:
Update grub to 0.94:
* Support building on x86-64 with gcc -m32.
* Use a BIOS call to turn on/off Gate A20. This should solve various
  problems related to Gate A20 in modern BIOSes.
* Add a workaround for buggy BIOSes (notably HP Vectra series) which
  don't pass the boot drive correctly.
* Display "GNU GRUB" instead of "GRUB" in the menu.
* Add support for QNX RTP into the grub shell.
* Add support for the initrd max address of a kernel header in Linux.
* Support 32 bit and 64 bit dev_t.
* Add support for an install device in GRUB's notation with no
  parenthesis (e.g. grub-install hd0).
* Improve the manual a lot.

While here, add a new build definition, GRUB_PRESET_COMMAND, which can be
set to a single command that will be embedded in grub's stage2 and executed
during bootup (useful for automated diskless setups).  Also make use of
BUILD_DEFS properly.  And pick up maintainership, as requested by tron@.