Because we don't have a centralized feature list, we would fire
this warning every time we use a feature override. Disable it
until we have a centralized list we can check.

Bug: angleproject:6085
Change-Id: Ia5c3f2ae8337141e963e67e1d71243a3d0a01c9a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2982505Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>