google-amber: fix build on Darwin

pkgs/tools/graphics/amber/default.nix

···
 , fetchFromGitHub
 , cmake
 , pkg-config
+, cctools
 , python3
 , vulkan-headers
 , vulkan-loader
···
     cmake
     pkg-config
     python3
+  ] ++ lib.optionals stdenv.isDarwin [
+    cctools
   ];
 
   # Tests are disabled so we do not have to pull in googletest and more dependencies

pkgs/top-level/all-packages.nix

···
 
   gtklp = callPackage ../tools/misc/gtklp { };
 
-  google-amber = callPackage ../tools/graphics/amber { };
+  google-amber = callPackage ../tools/graphics/amber {
+    inherit (darwin) cctools;
+  };
 
   hakrawler = callPackage ../tools/security/hakrawler { };