packaging: stop including lix-clang-tidy inside main src fileset

This will avoid making lix depend on nix-eval-jobs when that is merged as well.

cc: https://git.lix.systems/lix-project/lix/issues/384
Change-Id: I4a4292948f3a225391aea2fc0d57b739d960d9e8

package.nix

@@ -168,7 +168,8 @@ let
     ./meson.options
     ./meson
     ./scripts/meson.build
-    ./subprojects
+    (fileset.fileFilter (f: lib.strings.hasSuffix ".wrap" f.name) ./subprojects)
+    ./subprojects/aws_sdk
     # Required for meson to generate Cargo wraps
     ./Cargo.lock
   ]);