Ansify pxe_netif_close() and {,pxe}socktodesc()

To appease the clang 15 warning -Wdeprecated-non-prototype (turned on
by -Wall). ok millert@

Sync no-argument function declaration and definition by adding (void).
ok kettenis@ mpi@

Kill the remaining <netinet/in_systm.h> inclusion!

As on i386:

We don't want to pass the PXE MAC address to the kernel when booting
from a local disk, since the MAC address causes the kernel to look for
root on NFS. Do this by remembering (not addi

As on i386:

We don't want to pass the PXE MAC address to the kernel when booting
from a local disk, since the MAC address causes the kernel to look for
root on NFS. Do this by remembering (not adding to boot arguments) the
MAC address when opening the PXE device, and clearing this if we happen
to load a file off a non-network disk.

"works as advertised for me" todd@;
"stop sitting on this/no objections" deraadt@;
amd64 code mainly written by patch(1).

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push a BOOTARG_BOOTMAC (what PXE says is the MAC address of the interface
we are booting from) out towards the kernel; tested by reyk
crank the version too

Only use bangpxe calling on PXE 2.1 and above. Makes no difference on
current-spec PXE systems, but should allow some older ones to get a bit
further.

Diff from krw@. Tested by krw@ on several PXE

Only use bangpxe calling on PXE 2.1 and above. Makes no difference on
current-spec PXE systems, but should allow some older ones to get a bit
further.

Diff from krw@. Tested by krw@ on several PXE 2.1 cards. Many thanks.

ok krw@; "get these changes into the amd64" deraadt@

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KNF

Enter pxeboot on amd64. Initially intended to support network installs
using bsd.rd over TFTP.

ok deraadt@