libratbag: fix meson/python compatibility

pkgs/os-specific/linux/libratbag/default.nix

@@ -12,15 +12,14 @@ stdenv.mkDerivation rec {
     sha256 = "0cr5skrb7a5mgj7dkm647ib8336hb88bf11blaf6xldafi8b0jlj";
   };
 
-
-  # todo: python should be in buildInputs, but right now meson propagates
-  # its own python. see: https://github.com/NixOS/nixpkgs/pull/46020
   nativeBuildInputs = [
-    (python3.withPackages (ps: with ps; [ evdev pygobject3 ]))
     meson ninja pkgconfig gitMinimal swig check valgrind
   ];
 
-  buildInputs = [ glib systemd udev libevdev ];
+  buildInputs = [
+    glib systemd udev libevdev
+    (python3.withPackages (ps: with ps; [ evdev pygobject3 ]))
+  ];
 
   mesonFlags = [
     "-Dsystemd-unit-dir=./lib/systemd/system/"