refactor(nix): nix-filter -> lib.fileset

with our own use of `map`, this is basically a drop-in replacement for
nix-filter, but already in nixpkgs!

Signed-off-by: seth <getchoo@tuta.io>

nix/distribution.nix

@@ -26,24 +26,8 @@
     overlays.default = final: prev: let
       version = builtins.substring 0 8 self.lastModifiedDate or "dirty";
 
-      filteredSelf = inputs.nix-filter.lib.filter {
-        root = ../.;
-        include = [
-          "buildconfig"
-          "cmake"
-          "launcher"
-          "libraries"
-          "program_info"
-          "tests"
-          ../COPYING.md
-          ../CMakeLists.txt
-        ];
-      };
-
       # common args for prismlauncher evaluations
       unwrappedArgs = {
-        self = filteredSelf;
-
         inherit (inputs) libnbtplusplus;
         inherit ((final.darwin or prev.darwin).apple_sdk.frameworks) Cocoa;
         inherit version;

nix/pkg/default.nix

@@ -16,7 +16,6 @@
   gamemode,
   msaClientID ? null,
   gamemodeSupport ? stdenv.isLinux,
-  self,
   version,
   libnbtplusplus,
 }:
@@ -25,7 +24,19 @@ assert lib.assertMsg (stdenv.isLinux || !gamemodeSupport) "gamemodeSupport is on
     pname = "prismlauncher-unwrapped";
     inherit version;
 
-    src = lib.cleanSource self;
+    src = lib.fileset.toSource {
+      root = ../../.;
+      fileset = lib.fileset.unions (map (fileName: ../../${fileName}) [
+        "buildconfig"
+        "cmake"
+        "launcher"
+        "libraries"
+        "program_info"
+        "tests"
+        "COPYING.md"
+        "CMakeLists.txt"
+      ]);
+    };
 
     nativeBuildInputs = [extra-cmake-modules cmake jdk17 ninja canonicalize-jars-hook];
     buildInputs =