helvum: use rustPlatform.bindgenHook

pkgs/applications/audio/helvum/default.nix

@@ -40,6 +40,7 @@ stdenv.mkDerivation rec {
     rustPlatform.cargoSetupHook
     rustPlatform.rust.cargo
     rustPlatform.rust.rustc
+    rustPlatform.bindgenHook
   ];
 
   buildInputs = [
@@ -49,8 +50,6 @@ stdenv.mkDerivation rec {
     pipewire
   ];
 
-  LIBCLANG_PATH = "${libclang.lib}/lib";
-
   meta = with lib; {
     description = "A GTK patchbay for pipewire";
     homepage = "https://gitlab.freedesktop.org/pipewire/helvum";