nixos/*nix*: Add imports as inherently necessary

Albeit not technically necessary because of nixos//module-list.nix

Changed files
+6
nixos
modules
config
services
+4
nixos/modules/config/nix-remote-build.nix
···
in
{
+
imports = [
+
./nix.nix
+
];
+
options = {
nix = {
buildMachines = mkOption {
+2
nixos/modules/services/system/nix-daemon.nix
···
{
imports = [
+
../../config/nix.nix
+
(mkRenamedOptionModuleWith { sinceRelease = 2205; from = [ "nix" "daemonIONiceLevel" ]; to = [ "nix" "daemonIOSchedPriority" ]; })
(mkRenamedOptionModuleWith { sinceRelease = 2211; from = [ "nix" "readOnlyStore" ]; to = [ "boot" "readOnlyNixStore" ]; })
(mkRemovedOptionModule [ "nix" "daemonNiceLevel" ] "Consider nix.daemonCPUSchedPolicy instead.")