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MFC EFI HTTP Support: r349349, r349395, r349404, r349564-r349566, r349613,
r350444

r349349:
loader: add HTTP support using UEFI

Add support for an HTTP "network filesystem" using the UEFI's HTTP
stack.

This also supports HTTPS, but TianoCore EDK2 implementations currently
crash while fetching loader files.
Only IPv4 is supported at the moment. IPv6 support is planned for a
follow-up changeset.

Note that we include some headers from the TianoCore EDK II project in
stand/efi/include/Protocol verbatim, including links to the license instead
of including the full text because that's their preferred way of
communicating it, despite not being normal FreeBSD project practice.

r349395:
Disconnect EFI HTTP support

The EFI HTTP code has been causing boot failures for people, so disable it
while a fix is being worked on.

r349404:
Re-enable loader efi http boot and fix dv_open bug if dv_init failed

The code in efihttp.c was assuming that dv_open wouldn't be called if
dv_init failed. But the dv_init return value is currently ignored.

Add a new variable, `efihttp_init_done` and only proceed in dv_open if
it's true. This fixes the loader on systems without efi http support.

r349564:
Clean efihttp pointer-sign warnings

The Http protocol structure is using unsigned char strings, Use type casts
where needed.

r349565:
efihttp: comparison of integers of different signs

message.HeaderCount is UINTN (unsigned int), so should be i.

r349566:
efihttp: mark unused arguments with __unused

we do have __unused, lets use it.

r349613:
efihttp: mac and err can be used uninitialized

While there, also check if mac != NULL, and use pointer compare for ipv4
and dns.

r350444:
Fix EFI loader build when LOADER_NET_SUPPORT=no.

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