[build] Fix version.o dependency upon git index

Commit 8540300 ("[build] Disable ccache for all relevant build
targets") attempted to generalise the rule for $(BIN)/version.o to
$(BIN)/version.% in order to apply the dependency to all relevant
build targets (debug objects, assembly listings, etc).

This generalisation appears to work for the ccache override
directives, but seems to cause make (at least, GNU make 4.0) to simply
ignore the dependency upon the git index.

Since version.c contains only some string constants, there is unlikely
to be a substantive need for its debug objects, assembly listings,
etc.  Restore the previous form of the dependency and accept that
hypothetical builds with e.g. DEBUG=version will not be handled
correctly.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
[nfs] Fix an invalid free() when loading a symlink

Signed-off-by: Marin Hannache <git@mareo.fr>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
[tcp] Defer sending ACKs until all received packets have been processed

When running inside a virtual machine (or when using the UNDI driver),
transmitting packets can be expensive.  When we receive several
packets in one poll (e.g. because a slow BIOS timer interrupt routine
has caused us to fall behind in processing), we can safely send just a
single ACK to cover all of the received packets.  This reduces the
time spent transmitting and allows us to clear the backlog much
faster.

Various RFCs (starting with RFC1122) state that there should be an ACK
for at least every second segment.  We choose not to enforce this
rule.  Under normal operation each poll should find at most one
received packet, and we will then not delay any ACKs.  We delay
(i.e. omit) ACKs only when under sufficiently heavy load that we are
finding multiple packets per poll; under these conditions it is
important to clear the backlog quickly since any delay may lead to
dropped packets.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
[lkrnprefix] Function as a bzImage kernel

The .lkrn prefix currently provides a zImage kernel with unused setup
sectors and the whole iPXE binary placed within the "protected mode
kernel" portion of the zImage.

The work carried out years ago to create the .mrom format provides a
mechanism allowing the iPXE binary to be split into a small real-mode
header and a larger payload.  This neatly matches the way that a
bzImage is loaded: the "setup sectors" can contain the header and the
"protected mode kernel" can contain the payload.

This removes the size restrictions on an iPXE .lkrn image (and hence
on derived image formats such as .iso).

Also remove obsolete copyright information, since none of the original
code or functionality now remains.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
[build] Avoid errors when build directory is mounted via NFS

Reported-by: Robin Smidsrød <robin@smidsrod.no>
Signed-off-by: Michael Brown <mcb30@ipxe.org>