[syslinux] extlinux: missing text on serial output

[H. Peter Anvin]

H. Peter Anvin wrote:
> The attached patch should fix that; if you could try it out I 
> would hugely appreciate it.

Never mind this patch, it's broken (it destroys ECX, which is supposed 
to return the number of bytes read.)  I have fixed this and checked in a 
corrected patch into git; it is also being pushed out as 
syslinux-3.70-pre21.

	-hpa