[mesa] Migrate dirent test to Open3 Bug: 376575307 Change-Id: I6e944b588a8371ab5d00895b50c0c69634aa602f Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/mesa/+/1199505 Commit-Queue: Brandon Castellano <bcastell@google.com> Reviewed-by: Craig Stout <cstout@google.com>