Revert "Re-resubmit "Compile the D3D11 VS and PS on separate threads at GL link time"" Fails clang-win again. Apparently Clang mimics MSVS. This reverts commit af1bdff62ec4cc80b47fbac7e5d973f6f7225036. Change-Id: I48a503889a9e905fcdc9f101dbf98f7cb7912279 Reviewed-on: https://chromium-review.googlesource.com/250882 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>