public.bzl: update to replace Gif with Wuffs

Also, do away with complex exclude rules.  Explicit is often better.

Change-Id: I1d945c237a179f6db2552742fdf9e067d6d9eaf9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/254578
Commit-Queue: Hal Canary <halcanary@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Auto-Submit: Hal Canary <halcanary@google.com>
1 file changed