Document that patchelf warnings in zephyr toolchain are fine

packages/zephyr/toolchain.nix

@@ -19,7 +19,7 @@ stdenv.mkDerivation {
   installPhase = ''
     runHook preInstall
     mkdir -p "$out"
-    tar -C "$out" -xvf "$src"
+    tar -C "$out" -xf "$src"
     runHook postInstall
   '';
 
@@ -28,7 +28,9 @@ stdenv.mkDerivation {
     autoPatchelf ${target}/${target}/bin
     autoPatchelf ${target}/lib/bfd-plugins
     autoPatchelf ${target}/lib/gcc/${target}/*/plugin ${target}/libexec/gcc/${target}
-    echo "done with my autopatchelf"
+
+    # There are some patchelf errors after this, but it's just audit-tmpdir doing
+    # patchelf --print-rpath and shouldn't mess with anything
   '';
 
   meta = with lib; {