Update libwebp to 1.03 release candidate

This will allow us to run our tests on this version.

https://groups.google.com/a/webmproject.org/forum/?utm_medium=email&utm_source=footer#!msg/webp-discuss/I-tBj7AGg7g/uuAVbuU4BwAJ

Change-Id: I193780f2b2b9e894407aa5828fcfcb2d3e09bd7f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225719
Auto-Submit: Leon Scroggins <scroggo@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Leon Scroggins <scroggo@google.com>
1 file changed