Cannot build this project as some of the resources are private `401 (Unauthorized)`

Hello,

I am getting errors `401 (Unauthorized)` for the following links that are used in the building process from source of BuildXL:

  * https://pkgs.dev.azure.com/ms/BuildXL/_packaging/BuildXL.Selfhost/nuget/v3/index.json
  * https://pkgs.dev.azure.com/ms/BuildXL/_packaging/BuildXL/nuget/v3/index.json

Thank you.