Infrastructure for btrfs, plus an import of the btrfs code written for
Grub 0.97.  It does not yet compile and will need significant changes
still.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Preemptively move filesystem-specific files into core/fs/<fsname> so
we can start trying to pretend to be organized.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Kill hack we used to generate a dynamic symbol table.  There is a much
better technique for doing this which is already deployed on the
"dynamic" branch.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Resolved Conflicts:
	core/extlinux.asm
	core/pxelinux.asm

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

So, now we have all the fs converted, and the rest is to make it better and more simple

the others Syslinux derivative disabled for now

Extract symbol table information to be exported to modules.  This is a
really hacky way of doing it, so replace it later.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Let's require NASM 2.03 or later, so we can use the -MD and -MP
options to generate dependencies.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

NASM 2.03 or higher can generate DWARF debugging info, which is also
what gcc produces.  Mixing debugging info seems to cause a lot of
problems.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>