pkg/57076: Add efivar port to NetBSD

[sergii.dmytruk%3mdeb.com@localhost]

>Number:         57076
>Category:       pkg
>Synopsis:       Add efivar port to NetBSD
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 27 16:50:00 +0000 2022
>Originator:     Sergii Dmytruk
>Release:        NetBSD 9.99.100
>Organization:
3mdeb
>Environment:
NetBSD localhost 9.99.100 NetBSD 9.99.100 (MYKERNEL) #0: Wed Sep 28 18:19:26 UTC 2022 root@localhost:/usr/obj/sys/arch/amd64/compile/MYKERNEL amd64
>Description:
3mdeb made a port of efivar [1] for *BSD systems [2], which is a
dependency of fwupd project [3].  We want to upstream efivar as
a prerequisite for adding fwupd later.

[1]: https://github.com/rhboot/efivar
[2]: https://github.com/3mdeb/efivar/blob/bsd/BSD_PORTING.md
[3]: https://fwupd.org/

It's in pkgsrc-wip repo [4] at the moment.

[4]: https://github.com/NetBSD/pkgsrc-wip/tree/master/efivar

Please note that latest NetBSD release (9.3) doesn't have EFI
ioctls nor relevant headers which are necessary to build the
port even though the changes were accepted quite some time ago.
Does it need to be enabled for the platform first?  Any plans
for that?
>How-To-Repeat:

>Fix: