mdbook: fix Darwin support (#59385)

pkgs/tools/text/mdbook/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, rustPlatform, CoreServices }:
+{ stdenv, fetchFromGitHub, rustPlatform, CoreServices, darwin }:
 
 rustPlatform.buildRustPackage rec {
   name = "mdbook-${version}";
@@ -13,17 +13,17 @@ rustPlatform.buildRustPackage rec {
 
   cargoSha256 = "0kcc0b2644qbalz7dnqwxsjdmw1h57k0rjrvwqh8apj2sgl64gyv";
 
-  buildInputs = stdenv.lib.optionals stdenv.isDarwin [ CoreServices ];
+  buildInputs = stdenv.lib.optionals stdenv.isDarwin [
+    CoreServices
+    # This is needed to avoid an undefined symbol error for "_CFURLResourceIsReachable"
+    darwin.cf-private
+  ];
 
   meta = with stdenv.lib; {
     description = "Create books from MarkDown";
     homepage = https://github.com/rust-lang-nursery/mdbook;
     license = [ licenses.asl20 licenses.mit ];
     maintainers = [ maintainers.havvy ];
     platforms = platforms.all;
-
-    # Because CoreServices needs to be updated,
-    # but Apple won't release the source.
-    broken = stdenv.isDarwin;
   };
 }