module/lib: try to pass specialArgs to eval

[Pacman99]

fixes #353

Allows hosts to make use of specialArgs if they are using a new enough version of nixpkgs and lib/evalModules. Specifically the change from NixOS/nixpkgs#121870 is needed. I don't think there is any way to fix this problem for people using older versions.

[samueldr]

Let's wait for at least one nixos-unstable bump with the required changes. (Unless this evaluates properly on the current unstable when you're not using specialArgs...)

[Pacman99]

Unless this evaluates properly on the current unstable when you're not using specialArgs

I'm not sure if I understand this right, but this should evaluate properly on any nixpkgs version because of the args.specialArgs or { }. So it only helps if your using the latest nixpkgs. But I don't think it can hurt whether or not you use specialArgs. I might be missing some possible error from this, not sure.

But waiting makes sense for general stability.

[samueldr]

(To be fair I haven't yet looked at the PR, so when I'll take a look or if someone else does in-depth testing we'll see :))

[colemickens]

Have you had a chance to test this @Pacman99 ?

[Pacman99]

I have tested that this PR evaluates with a mobile-nixos build - couldn't get it to actually build for unrelated reasons. And I just used this concept over at divnix/digga#51 which essentially does the same thing.