Update spirv-cross to f38cbeb814c73510b85697adbe5e894f9eac978f. This includes some bug fixes needed by Metal back-end's later commits. Bug: angleproject:2634 Change-Id: Idaa1461a0929cc998f7f7c11eaea5219ef63f801 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2192568 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>