cargo-bazel: add libz as buildInput for darwin (#408397)

pkgs/by-name/ca/cargo-bazel/package.nix

@@ -1,7 +1,9 @@
 {
   lib,
+  stdenv,
   fetchCrate,
   rustPlatform,
+  libz,
 }:
 
 rustPlatform.buildRustPackage rec {
@@ -13,6 +15,8 @@ rustPlatform.buildRustPackage rec {
     hash = "sha256-FS1WFlK0YNq1QCi3S3f5tMN+Bdcfx2dxhDKRLXLcios=";
   };
 
+  buildInputs = lib.optional stdenv.isDarwin libz;
+
   useFetchCargoVendor = true;
   cargoHash = "sha256-E/yF42Vx9tv8Ik1j23El3+fI19ZGzq6nikVMATY7m3E=";