* grub-core/boot/i386/pc/lnxboot.S: Scan for multiboot signature
rather than hardcoding the address.
* grub-core/boot/i386/pc/startup_raw.S: Add new data field
no_reed_solomon_length.
Move gate_a20 to no-reed-solomon part.
Don't force a particular size of no reed-solomon part.
* include/grub/offsets.h (GRUB_KERNEL_I386_PC_NO_REED_SOLOMON_PART):
Removed.
(GRUB_KERNEL_I386_PC_NO_REED_SOLOMON_LENGTH): New define.
* util/grub-setup.c (setup): Read no_rs_length from the image itself.