Nix: corrections for overlays, overrideable systems (#2929)

* nix: overlays: move waybar-hyprland to own overlay

* flake: use legacyPackages for formatter

Run `nix fmt` for all files.

* flake: move default overlay to nix/overlays.nix

* nix: lib: remove lib

* nix: overlays: extras: explicitly include xdph overlays

* nix: use interpolation for versions

* nix: overlays: include deps with hyprland-packages

* flake: make systems overrideable

* flake: packages: inherit from overlaid pkgsFor

flake.lock

@@ -4,14 +4,17 @@
       "inputs": {
         "nixpkgs": [
           "nixpkgs"
+        ],
+        "systems": [
+          "systems"
         ]
       },
       "locked": {
-        "lastModified": 1684265364,
-        "narHash": "sha256-AxNnWbthsuNx73HDQr0eBxrcE3+yfl/WsaXZqUFmkpQ=",
+        "lastModified": 1691753796,
+        "narHash": "sha256-zOEwiWoXk3j3+EoF3ySUJmberFewWlagvewDRuWYAso=",
         "owner": "hyprwm",
         "repo": "hyprland-protocols",
-        "rev": "8c279b9fb0f2b031427dc5ef4eab53f2ed835530",
+        "rev": "0c2ce70625cb30aef199cb388f99e19a61a6ce03",
         "type": "github"
       },
       "original": {
@@ -40,10 +43,26 @@
       "inputs": {
         "hyprland-protocols": "hyprland-protocols",
         "nixpkgs": "nixpkgs",
+        "systems": "systems",
         "wlroots": "wlroots",
         "xdph": "xdph"
       }
     },
+    "systems": {
+      "locked": {
+        "lastModified": 1689347949,
+        "narHash": "sha256-12tWmuL2zgBgZkdoB6qXZsgJEH9LR3oUgpaQq2RbI80=",
+        "owner": "nix-systems",
+        "repo": "default-linux",
+        "rev": "31732fcf5e8fea42e59c2488ad31a0e651500f68",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default-linux",
+        "type": "github"
+      }
+    },
     "wlroots": {
       "flake": false,
       "locked": {
@@ -70,14 +89,17 @@
         ],
         "nixpkgs": [
           "nixpkgs"
+        ],
+        "systems": [
+          "systems"
         ]
       },
       "locked": {
-        "lastModified": 1691082525,
-        "narHash": "sha256-C5AO0KnyAFJaCkOn+5nJfWm0kyiPn/Awh0lKTjhgr7Y=",
+        "lastModified": 1691841170,
+        "narHash": "sha256-RCTm1/MVWYPnReMgyp7tr2ogGYo/pvw38jZaFwemgPU=",
         "owner": "hyprwm",
         "repo": "xdg-desktop-portal-hyprland",
-        "rev": "42747d267ab4345c4ceb78cd4a4fe99f072d80fc",
+        "rev": "57a3a41ba6b358109e4fc25c6a4706b5f7d93c6b",
         "type": "github"
       },
       "original": {