[syslinux] IBA 4.x -> broken localboot in pxelinux

[alex at pilosoft.com]

As subject says: With Intel PXE stack version 4.x (stack identifies itself
in BIOS as IBA 4.0.x or 4.1.x), pxelinux' localboot option hangs instead 
of going to BIOS. This does not happen with older PXE stack.

I have a feeling that the this broke somewhere in version 2.x - I
*believe* 1.75 PXELINUX works fine - but haven't had a chance to try 
again.

-alex