GTest complains that we don't run some tests on D3D/Vulkan backends.
They only run on GL backend, which is disabled on Win AMD
per http://anglebug.com/5123

Bug: chromium:1183147
Change-Id: I95fdd9a24aff69aa60e2f60613d8300ae1019a27
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2726576Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>