resholve Nix API mangling package meta

[abathur]

It looks like the resholve builders are holding something wrong and it's throwing off how resholved packages' meta.position is set.

I suspect I need to pull at least .meta in from the initial package.

The sources button led to https://github.com/NixOS/nixpkgs/blob/nixos-unstable/pkgs/development/misc/resholve/resholve-utils.nix#L181 on nixpkgs search, so I got confused

Originally posted by @Samisafool in NixOS/nixpkgs#190800 (comment)

[abathur]

I've opened NixOS/nixpkgs#191003 to tentatively address this in Nixpkgs. Once it's clear that approach is acceptable there, I'll make an ~identical commit here to close this issue.