Return the first match we find in the list, not the first match we
can find on the PCI bus.  This allows us to have more specific matches
first followed by less specific matches.

We try to read pci.ids over and over to get human-readable strings,
and reserve enormous amounts of memory for them.  We don't ever
actually use them.  If we want to have a PCI database we should do
that elsewhere, and better.

Provide a method for re-loading shuffle descriptors from a buffer in
high memory when the shuffle descriptors are too many to fit in the
buffer.  This can happen when trying to stitch an initramfs together
from parts.  Still need library support for this, however.

- Move extlinux boot stuff into /boot/extlinux
- /etc/extlinux.conf -> /boot/extlinux/extlinux.conf symlink.

Move <syslinux.h> to <syslinux/idle.h> since that was all that was there;
do_idle() in libutil can simply be a macro for syslinux_idle() or
sched_yield() as appropriate.

Load a Linux module, generate initramfs and optionally add
/dhcpinfo.dat with the DHCP query information.