Revert "New GIF codec; new third_party/wuffs dep"

This reverts commit 60009388be154f9f65b9e3336c0b460851541aef.

Reason for revert: Breaking Google3 roll.

Original change's description:
> New GIF codec; new third_party/wuffs dep
> 
> Bug: skia:8235
> Change-Id: I883e05bc50c48f822b5ac3884f25ae67d21c94a9
> Reviewed-on: https://skia-review.googlesource.com/c/136940
> Commit-Queue: Leon Scroggins <scroggo@google.com>
> Reviewed-by: Leon Scroggins <scroggo@google.com>

TBR=scroggo@google.com,nigeltao@google.com

Change-Id: I515c5144d0475173ce8f854f4f00f59c4655fdc4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:8235
Reviewed-on: https://skia-review.googlesource.com/c/164903
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
11 files changed