build: Only add gudev_dep/libudev_dep once

We already add them if have_libgudev is true, and for native builds it
always is true.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4130>

src/meson.build

@@ -143,10 +143,8 @@ endif
 if have_native_backend
   mutter_pkg_private_deps += [
     libinput_dep,
-    gudev_dep,
     libgbm_dep,
     logind_provider_dep,
-    libudev_dep,
     xkbcommon_dep,
   ]
 endif