python3Packages.mlx: remove gguf-tools source checkout from buildInputs

The `gguf-tools` are defined in `let` section to point to a source
checkout, not nixpkgs derivation.

Note: regardless, the tools are not used in runtime. Instead, some files
from the source checkout are statically compiled during the build.

pkgs/development/python-modules/mlx/default.nix

@@ -104,7 +104,6 @@ buildPythonPackage (finalAttrs: {
 
   buildInputs = [
     fmt
-    gguf-tools
     nlohmann_json
     pybind11
   ]