Add fromStatT() implementation for NetBSD

[iamleot]

- What I did

When packaging amazon-ecs-cli in pkgsrc-wip I have noticed build failure due non-existent stat_netbsd.go.

- How I did it

On a NetBSD machine that supports Go, assuming pkgsrc tree and
pkgsrc-wip tree are checked out, try:

% cd pkgsrc/wip/amazon-ecs-cli
% rm patches/patch-ecs-cli_vendor_github.com_docker_docker_pkg_system_stat__netbsd.go
% make mps
% make

- How to verify it

Please see above.

- Description for the changelog

Add fromStatT() implementation for NetBSD

- A picture of a cute animal (not mandatory but encouraged)

N/A, sorry! :)

But here a nice goat emoji!:

🐐

[thaJeztah]

looks like there's some duplication in the various fromStatT implementations (e.g. freebsd and netbsd now look the same).

Perhaps someone wants to have a look at combining some of those in a follow-up.

LGTM

[thaJeztah]

Looks like this conversion is redundant on netbsd, or did you add on purpose? (if so, perhaps this requires a //nolint:unconvert)

[thaJeztah]

Same question here

[iamleot]

Replying to both questions here: yeah, both conversions should be useless and can be removed (I've also locally patched them and double-checked them).

@thaJeztah OK to open a new PR to remove them?

Thank you very much @viandc, @AkihiroSuda and @thaJeztah for the quick reviews and merge!

[thaJeztah]

If you have time to look at cleaning up the duplicates (I think if we keep the conversion in that one to take different cases into account, that's ok)

[iamleot]

Thanks @thaJeztah, I've just opened #41448 that does that.