treewide: fix loss of precision in NixOS systems

Prior to this patch:

	$ nix-instantiate --eval -E '
	>   with import ./. {
	>     localSystem.config = "aarch64-unknown-linux-musl";
	>   };
	>   (nixos {}).config.nixpkgs.localSystem.config
	> '
	"aarch64-unknown-linux-gnu"

Because only the system triple was being passed through, the Musl part
of the system specification was lost.  This patch fixes various
occurrences of NixOS evaluation when a Nixpkgs evaluation is already
available, to pass through the full elaborated system attribute set,
to avoid this loss of precision.

0 files changed, 0 insertions, 0 deletions