Reimplement notice file generation for third-party licenses through Rust, now with CEF credits (#3808)

.nix/deps/cef.nix

@@ -1,4 +1,4 @@
-{ pkgs, inputs, ... }:
+{ pkgs, ... }:
 
 let
   cefPath = pkgs.cef-binary.overrideAttrs (finalAttrs: {
@@ -10,6 +10,8 @@ let
       mv ./Resources/* $out/
       mv ./include $out/
 
+      cat ./CREDITS.html | ${pkgs.xz}/bin/xz -9 -e -c > $out/CREDITS.html.xz
+
       echo '${
         builtins.toJSON {
           type = "minimal";

.nix/deps/rust-gpu.nix

@@ -1,4 +1,4 @@
-{ pkgs, inputs, ... }:
+{ pkgs, ... }:
 
 let
   extensions = [