Make GRUB's kernel compliant to Multiboot Specification.
* kern/i386/pc/startup.S (multiboot_header): New label.
(multiboot_entry): Likewise.
(multiboot_trampoline): Likewise.
* include/grub/i386/pc/kernel.h (GRUB_KERNEL_MACHINE_RAW_SIZE):
Increased to 0x4A0.
* fs/xfs.c (grub_xfs_iterate_dir): Fix a syntax error. You may not
put parentheses after a question mark.
[!GRUB_UTIL] (my_mod): New variable.
* util/grub-emu.c (main): Call grub_xfs_init and grub_xfs_fini.