message: Trivial print out change
  An error message now contains a command that we can copy-paste directly to powershell
  vcpkg update   =>      .\\vcpkg update
  Adding two slashes to escape the output
diff: @@ -49,7 +49,7 @@ namespace vcpkg::Commands::Build
  if (return_code != 0)
  {
  System::println(System::color::error, "Error: building package %s failed", spec.toString());
  - System::println("Please ensure sure you're using the latest portfiles with `vcpkg update`, then\n"
  + System::println("Please ensure sure you're using the latest portfiles with `.\\vcpkg update`, then\n"
  "submit an issue at https://github.com/Microsoft/vcpkg/issues including:\n"
  " Package: %s\n"
  " Vcpkg version: %s\n"
  